About
About
Measurement of length and time
Description
Play with the Vernier Caliper Model. Test what you've learned by trying
the input field.
Vernier calipers can measure internal dimensions
(using the uppermost jaws in the picture at right), external dimensions
using the pictured lower jaws, and depending on the manufacturer, depth
measurements by the use of a probe that is attached to the movable head
and slides along the centre of the body. This probe is slender and can get
into deep grooves that may prove difficult for other measuring tools.
The
vernier scales can be in
metric
measurements on the upper and lower part of the scale.
Vernier calipers
commonly used in industry provide a precision to a hundredth of a
millimetre (10
micrometres ).
A
more precise instrument used for the same purpose is the
micrometer
Parts of a vernier caliper:
Outside jaws: used to measure external diameter or width of an object
(Blue)
Inside jaws: used to measure internal diameter of an object
Depth
probe: used to measure depths of an object or a hole ( not shown in this
model)
Main scale: gives measurements in mm.
Vernier gives
measurements up to one decimal places in mm
Retainer: used to block
movable part to allow the easy transferring a measurement ( not shown in
this model)
The Vernier calipers model has
an object (Blue)
for the internal jaws to measure width of an object with slider to control
width of the object and simple drag action to control position of object.
an
object (Green) for external jaws to measure internal diameter of a
cylinder for example with slider to control dimensions of the cylinder.
a
slider for zero error slider
checkbox for hint to scaffold the learners
attention and point of focus
checkbox for answer to show the meaning of
reading on the main scale and the vernier scale with zero error
calculations if any.
drop down menu of the various common vernier
scales for sense making and additional testing out by learners their ideas
of how vernier works.
fine <> control buttons for learners to
manipulate the model with single incremental precision
slider control
for fast changes in the vernier measurement
reset button to bring
simulaton back to original (default) setting.
Sample Learning Goals
(g) describe how to measure a variety of lengths with appropriate accuracy
by means of tapes, rules, micrometers and calipers, using a vernier scale
as necessary.
Research
arXiv:1408.3803 [
pdf ]
Vernier
caliper and micrometer computer models using Easy Java Simulation and its
pedagogical design feature-ideas to augment learning with real instruments
Loo
Kang Wee ,
Hwee
Tiang Ning Comments: 8 pages, 8 figures, Physics Education journal
Subjects:
Physics Education (physics.ed-ph); Instrumentation and Detectors
(physics.ins-det)
https://youtu.be/jHoA5M-_1R4 VIDEO
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FROM ospsg_usergroups AS `groups`id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE groups NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 9 100.00 NULL
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.01 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.02 ms executing 0.03 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 15 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 14 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 13 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/user.php:46 12 acym_getGroups() JROOT/administrator/components/com_acym/dynamics/createuser/plugin.php:21 11 plgAcymcreateuser->__construct() JROOT/administrator/components/com_acym/libraries/joomla/extension.php:118 10 acym_loadPlugins() JROOT/administrator/components/com_acym/helpers/global/addon.php:21 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.86 ms After last query: 8.46 ms Query memory: 0.006 MB Memory before query: 15.250 MB
UPDATE `ospsg_extensions `
SET `params` = '{\"mediaversion\":\"f8725ff0f3003a56ced6d3adfe437e4d\"}'
WHERE `type` = 'library' AND `element` = 'joomla'EXPLAIN not possible on query: UPDATE `ospsg_extensions`
SET `params` = '{\"mediaversion\":\"f8725ff0f3003a56ced6d3adfe437e4d\"}'
WHERE `type` = 'library' AND `element` = 'joomla'
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.01 ms System lock 0.07 ms updating 0.18 ms end 0.01 ms query end 0.00 ms waiting for handler commit 2.44 ms closing tables 0.02 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 14 JDatabaseDriverMysqli->execute() JROOT/libraries/src/Helper/LibraryHelper.php:117 13 Joomla\CMS\Helper\LibraryHelper::saveParams() JROOT/libraries/src/Version.php:372 12 Joomla\CMS\Version->setMediaVersion() JROOT/libraries/src/Version.php:331 11 Joomla\CMS\Version->getMediaVersion() JROOT/libraries/src/Factory.php:778 10 Joomla\CMS\Factory::createDocument() JROOT/libraries/src/Factory.php:234 9 Joomla\CMS\Factory::getDocument() JROOT/plugins/system/cwgears/cwgears.php:200 8 plgSystemCwgears->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.56 ms After last query: 4.23 ms Query memory: 0.028 MB Memory before query: 15.868 MB Rows returned: 42
SELECT `id`,`name`,`rules`,`parent_id`
FROM `ospsg_assets `
WHERE `name` IN ('root.1','com_actionlogs','com_acym','com_admin','com_ajax','com_associations','com_banners','com_cache','com_categories','com_checkin','com_config','com_contact','com_content','com_contenthistory','com_contenttemplater','com_cpanel','com_extplorer','com_fields','com_finder','com_hitstepsanalytics','com_installer','com_ipmapping','com_jce','com_joomlaupdate','com_languages','com_login','com_mailto','com_media','com_menus','com_messages','com_modules','com_newsfeeds','com_osmap','com_plugins','com_postinstall','com_privacy','com_redirect','com_regularlabsmanager','com_search','com_tags','com_templates','com_users','com_wrapper')id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_assets NULL range idx_asset_name idx_asset_name 202 NULL 43 100.00 Using index condition
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.06 ms preparing 0.01 ms executing 0.28 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.02 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 18 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 17 JDatabaseDriver->loadObjectList() JROOT/libraries/src/Access/Access.php:429 16 Joomla\CMS\Access\Access::preloadComponents() JROOT/libraries/src/Access/Access.php:213 15 Joomla\CMS\Access\Access::preload() JROOT/libraries/src/Access/Access.php:531 14 Joomla\CMS\Access\Access::getAssetRules() JROOT/libraries/src/Access/Access.php:183 13 Joomla\CMS\Access\Access::check() JROOT/libraries/src/User/User.php:398 12 Joomla\CMS\User\User->authorise() JROOT/components/com_content/models/article.php:58 11 ContentModelArticle->populateState() JROOT/libraries/src/MVC/Model/BaseDatabaseModel.php:457 10 Joomla\CMS\MVC\Model\BaseDatabaseModel->getState() JROOT/components/com_content/models/article.php:251 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.06 ms After last query: 0.12 ms Query memory: 0.282 MB Memory before query: 15.919 MB Rows returned: 1677
SELECT `id`,`name`,`rules`,`parent_id`
FROM `ospsg_assets `
WHERE `name` LIKE 'com_content.%' OR `name` = 'com_content' OR `parent_id` = 0id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_assets NULL ALL idx_asset_name,idx_parent_id NO INDEX KEY COULD BE USED NULL NULL 3187 20.55 Using where
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.01 ms statistics 0.04 ms preparing 0.01 ms executing 1.86 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.00 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 18 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 17 JDatabaseDriver->loadObjectList() JROOT/libraries/src/Access/Access.php:359 16 Joomla\CMS\Access\Access::preloadPermissions() JROOT/libraries/src/Access/Access.php:226 15 Joomla\CMS\Access\Access::preload() JROOT/libraries/src/Access/Access.php:540 14 Joomla\CMS\Access\Access::getAssetRules() JROOT/libraries/src/Access/Access.php:183 13 Joomla\CMS\Access\Access::check() JROOT/libraries/src/User/User.php:398 12 Joomla\CMS\User\User->authorise() JROOT/components/com_content/models/article.php:58 11 ContentModelArticle->populateState() JROOT/libraries/src/MVC/Model/BaseDatabaseModel.php:457 10 Joomla\CMS\MVC\Model\BaseDatabaseModel->getState() JROOT/components/com_content/models/article.php:251 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 1.21 ms After last query: 1.98 ms Query memory: 0.031 MB Memory before query: 17.295 MB Rows returned: 31
SHOW FULL COLUMNS FROM `ospsg_content `EXPLAIN not possible on query: SHOW FULL COLUMNS FROM `ospsg_content`
Status Duration starting 0.05 ms Executing hook on transaction 0.00 ms starting 0.02 ms checking permissions 0.00 ms checking permissions 0.00 ms Opening tables 0.30 ms init 0.01 ms System lock 0.01 ms optimizing 0.03 ms statistics 0.06 ms preparing 0.02 ms Creating tmp table 0.03 ms executing 0.04 ms checking permissions 0.03 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.04 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.02 ms cleaning up 0.02 ms
# Caller File and line number 16 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 15 JDatabaseDriver->loadObjectList() JROOT/libraries/joomla/database/driver/mysqli.php:448 14 JDatabaseDriverMysqli->getTableColumns() JROOT/libraries/src/Table/Table.php:261 13 Joomla\CMS\Table\Table->getFields() JROOT/libraries/src/Table/Table.php:180 12 Joomla\CMS\Table\Table->__construct() JROOT/libraries/src/Table/Content.php:39 11 Joomla\CMS\Table\Content->__construct() JROOT/libraries/src/Table/Table.php:328 10 Joomla\CMS\Table\Table::getInstance() JROOT/components/com_content/models/article.php:253 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.50 ms After last query: 1.80 ms Query memory: 0.006 MB Memory before query: 17.554 MB
UPDATE ospsg_content
SET `hits` = (`hits` + 1)
WHERE `id` = '5'EXPLAIN not possible on query: UPDATE ospsg_content
SET `hits` = (`hits` + 1)
WHERE `id` = '5'
Status Duration starting 0.03 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.01 ms System lock 0.03 ms updating 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 2.23 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 11 JDatabaseDriverMysqli->execute() JROOT/libraries/src/Table/Table.php:1264 10 Joomla\CMS\Table\Table->hit() JROOT/components/com_content/models/article.php:254 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.43 ms After last query: 70.26 ms Query memory: 0.024 MB Memory before query: 18.770 MB Rows returned: 1
SELECT * FROM ospsg_acym_list WHERE type = 'standard'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_list NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 1 100.00 Using where
Status Duration starting 0.10 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.05 ms init 0.01 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.02 ms preparing 0.02 ms executing 0.05 ms end 0.01 ms query end 0.01 ms waiting for handler commit 0.01 ms closing tables 0.02 ms freeing items 0.02 ms cleaning up 0.02 ms
# Caller File and line number 17 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 16 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 15 acym_loadObjectList() JROOT/administrator/components/com_acym/classes/list.php:485 14 AcyMailing\Classes\ListClass->getAllForSelect() JROOT/administrator/components/com_acym/classes/form.php:25 13 AcyMailing\Classes\FormClass->__construct() JROOT/plugins/system/acymtriggers/acymtriggers.php:175 12 plgSystemAcymtriggers->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.25 ms After last query: 0.99 ms Query memory: 0.024 MB Memory before query: 18.976 MB Rows returned: 3
SELECT * FROM ospsg_acym_field id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_field NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 3 100.00 NULL
Status Duration starting 0.03 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.01 ms executing 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 17 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 16 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 15 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/class.php:58 14 AcyMailing\Libraries\acymClass->getAll() JROOT/administrator/components/com_acym/classes/form.php:28 13 AcyMailing\Classes\FormClass->__construct() JROOT/plugins/system/acymtriggers/acymtriggers.php:175 12 plgSystemAcymtriggers->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.27 ms After last query: 0.11 ms Query memory: 0.023 MB Memory before query: 19.006 MB Rows returned: 0
SELECT * FROM ospsg_acym_form WHERE active = 1 AND type != 'shortcode'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_form NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 1 100.00 Using where
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.01 ms preparing 0.01 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 16 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 15 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 14 acym_loadObjectList() JROOT/administrator/components/com_acym/classes/form.php:450 13 AcyMailing\Classes\FormClass->getAllFormsToDisplay() JROOT/plugins/system/acymtriggers/acymtriggers.php:176 12 plgSystemAcymtriggers->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.18 ms After last query: 0.56 ms Query memory: 0.022 MB Memory before query: 19.048 MB Rows returned: 0
SELECT uikit
FROM `ospsg_cwgears `
WHERE url = 'https://www.sg.iwant2study.org/ospsgx/index.php/interactive-resources/mathematics/125-pure-mathematics/5-calculus/5-3-integration-techniques'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NO INDEX KEY COULD BE USED NULL NULL NULL NULL no matching row in const table
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.01 ms executing 0.01 ms end 0.00 ms query end 0.00 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 15 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 14 JDatabaseDriver->loadResult() JROOT/plugins/system/cwgears/helpers/loadcount.php:64 13 CwGearsHelperLoadcount::getCounts() JROOT/plugins/system/cwgears/cwgears.php:337 12 plgSystemCwgears->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.18 ms After last query: 0.07 ms Query memory: 0.022 MB Memory before query: 19.055 MB Rows returned: 0
SELECT uikit_plus
FROM `ospsg_cwgears `
WHERE url = 'https://www.sg.iwant2study.org/ospsgx/index.php/interactive-resources/mathematics/125-pure-mathematics/5-calculus/5-3-integration-techniques'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NO INDEX KEY COULD BE USED NULL NULL NULL NULL no matching row in const table
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.01 ms statistics 0.02 ms executing 0.01 ms end 0.00 ms query end 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 15 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 14 JDatabaseDriver->loadResult() JROOT/plugins/system/cwgears/helpers/loadcount.php:64 13 CwGearsHelperLoadcount::getCounts() JROOT/plugins/system/cwgears/cwgears.php:346 12 plgSystemCwgears->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.47 ms After last query: 1.55 ms Query memory: 0.020 MB Memory before query: 19.198 MB Rows returned: 1
SELECT `value` FROM ospsg_acym_configuration WHERE `name` LIKE "%regacy" OR `name` LIKE "%\_sub"id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_configuration NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 132 20.99 Using where
Status Duration starting 0.05 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.03 ms init 0.01 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.02 ms preparing 0.02 ms executing 0.14 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.03 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 10 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1550 9 JDatabaseDriver->loadColumn() JROOT/plugins/system/acymtriggers/acymtriggers.php:215 8 plgSystemAcymtriggers->applyRegacy() JROOT/plugins/system/acymtriggers/acymtriggers.php:208 7 plgSystemAcymtriggers->onAfterRender() JROOT/libraries/joomla/event/event.php:70 6 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 5 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 4 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1118 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.08 ms After last query: 0.10 ms Query memory: 0.026 MB Memory before query: 19.205 MB Rows returned: 142
SHOW TABLES EXPLAIN not possible on query: SHOW TABLES
Status Duration checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.04 ms cleaning up 0.02 ms
# Caller File and line number 13 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1550 12 JDatabaseDriver->loadColumn() JROOT/libraries/joomla/database/driver/mysqli.php:505 11 JDatabaseDriverMysqli->getTableList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:116 10 acym_getTableList() JROOT/administrator/components/com_acym/helpers/global/addon.php:10 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:258 8 plgSystemAcymtriggers->applyRegacy() JROOT/plugins/system/acymtriggers/acymtriggers.php:208 7 plgSystemAcymtriggers->onAfterRender() JROOT/libraries/joomla/event/event.php:70 6 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 5 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 4 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1118 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
21 Query Types Logged, Sorted by Occurrences. SELECT Tables: 2 × SELECT * FROM ospsg_acym_plugi 2 × SELECT `id`,`name`,`rules`,`parent_id` FROM `ospsg_assets ` 1 × SELECT `data` FROM `ospsg_session ` 1 × SELECT `session_id` FROM `ospsg_session ` 1 × SELECT id, rules FROM `ospsg_viewlevels 1 × SELECT b.id FROM ospsg_usergroups AS a LEFT JOIN ospsg_usergroups AS b ON b.lft <= a.lft AND b.rgt >= a.rgt 1 × SELECT count(* ) FROM `ospsg_cwgears_schedule 1 × SELECT count(* ) FROM `ospsg_cwgears_schedule ` 1 × SELECT * FROM ospsg_acym_configuratio 1 × SELECT `groups`.* , `groups`.title AS text, `groups`.id AS `value` FROM ospsg_usergroups AS `groups 1 × SELECT * FROM ospsg_acym_list 1 × SELECT * FROM ospsg_acym_fiel 1 × SELECT * FROM ospsg_acym_form 1 × SELECT uikit FROM `ospsg_cwgears ` 1 × SELECT uikit_plus FROM `ospsg_cwgears ` 1 × SELECT `value` FROM ospsg_acym_configuration OTHER Tables: 2 × SHOW TABLE 1 × INSERT INTO `ospsg_session ` (`session_id`,`guest`,`time`,`userid`,`username`,`client_id`) VALUES (X'3461616533363261376335343566626266376566656537353663343463613061', 1, 1777105376, 0, '', 0 1 × UPDATE `ospsg_extensions ` SET `params` = '{\"mediaversion\":\"f8725ff0f3003a56ced6d3adfe437e4d\"}' 1 × SHOW FULL COLUMNS FROM `ospsg_content 1 × UPDATE ospsg_content SET `hits` = (`hits` + 1) Blackbody Radiation
Vernier calipers Vernier calipers can measure internal dimensions (using the
uppermost
jaws in the picture at right), external dimensions using the pictured
lower jaws, and depending on the manufacturer, depth measurements by
the use of a probe that is attached to the movable head and slides
along the centre of the body. This probe is slender and can get into
deep grooves that may prove difficult for other measuring tools.
The vernier scales can be in metric
measurements on the upper and lower part of the scale.
Vernier calipers commonly used in industry provide a precision to a
hundredth of a millimetre (10 micrometres ).
A more precise instrument used for the same purpose is the
micrometer
.Parts of a vernier caliper:
Outside jaws : used to measure external diameter or width
of an object (Blue)Inside jaws : used to measure internal diameter of an objectDepth probe : used to measure depths of an object or a hole
( not shown in this model)Main scale : gives measurements in mm.Vernier gives measurements up to one decimal places in mmRetainer : used to block movable part to allow the easy
transferring a measurement ( not shown in this model)
The Vernier calipers model has
an object (Blue) for the internal jaws to measure width of an
object with slider to control width of the object and simple drag
action to control position of object.
an object (Green) for external jaws to measure internal diameter
of a cylinder for example with slider to control dimensions of the
cylinder.
a slider for zero error slider
checkbox for hint to scaffold the learners attention and point of
focus
checkbox for answer to show the meaning of reading on the main
scale and the vernier scale with zero error calculations if any.
drop down menu of the various common vernier scales for sense
making and additional testing out by learners their ideas of how
vernier works.
fine <> control buttons for learners to manipulate the
model with single incremental precision
slider control for fast changes in the vernier measurement
reset button to bring simulaton back to original (default)
setting.
Credits:
The Vernier calipers model was created by created by Fu-Kwun Hwang,
customized by Loo Kang Wee and Wolfgang Christian using the
Easy Java Simulations (EJS) version 4.2 authoring and modeling
tool. An applet version of this model is available on the NTNU
website <
http://www.phy.ntnu.edu.tw/ntnujava/ >.
You can examine and modify this compiled EJS model if you run the
model (double click on the model's jar file), right-click within a
plot, and select "Open EJS Model" from the pop-up menu. You must,
of course, have EJS installed on your computer. Information about
EJS is available at: <http://www.um.es/fem/Ejs/ http://www.compadre.org/OSP/
Joomla! Debug Console {
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"session": {
"counter": 1,
"timer": {
"start": 1777105376,
"last": 1777105376,
"now": 1777105376
},
"token": "3Bc6TVl9LN8XxiPhjRh1QUwnHbe1TXVt"
},
"registry": {},
"user": {
"id": 0,
"name": null ,
"username": null ,
"email": null ,
"password": null ,
"password_clear": "",
"block": null ,
"sendEmail": 0,
"registerDate": null ,
"lastvisitDate": null ,
"activation": null ,
"params": null ,
"groups": [],
"guest": 1,
"lastResetTime": null ,
"resetCount": null ,
"requireReset": null ,
"aid": 0
}
}
}
20.02 MB (20,987,496 Bytes )
24 Queries Logged 19.24 ms Query Time: 0.29 ms Query memory: 0.023 MB Memory before query: 4.160 MB Rows returned: 0
SELECT `data`
FROM `ospsg_session `
WHERE `session_id` = X'3461616533363261376335343566626266376566656537353663343463613061'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_session NULL const PRIMARY PRIMARY 194 const 1 100.00 NULL
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.09 ms executing 0.01 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 16 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 15 JDatabaseDriver->loadResult() JROOT/libraries/joomla/session/storage/database.php:45 14 JSessionStorageDatabase->read() Same as call in the line below. 13 session_start() JROOT/libraries/joomla/session/handler/native.php:260 12 JSessionHandlerNative->doSessionStart() JROOT/libraries/joomla/session/handler/native.php:50 11 JSessionHandlerNative->start() JROOT/libraries/joomla/session/handler/joomla.php:88 10 JSessionHandlerJoomla->start() JROOT/libraries/src/Session/Session.php:661 9 Joomla\CMS\Session\Session->_start() JROOT/libraries/src/Session/Session.php:621 8 Joomla\CMS\Session\Session->start() JROOT/libraries/src/Session/Session.php:499 7 Joomla\CMS\Session\Session->get() JROOT/libraries/src/Session/Session.php:456 6 Joomla\CMS\Session\Session->isNew() JROOT/libraries/src/Application/CMSApplication.php:826 5 Joomla\CMS\Application\CMSApplication->loadSession() JROOT/libraries/src/Application/CMSApplication.php:136 4 Joomla\CMS\Application\CMSApplication->__construct() JROOT/libraries/src/Application/SiteApplication.php:66 3 Joomla\CMS\Application\SiteApplication->__construct() JROOT/libraries/src/Application/CMSApplication.php:386 2 Joomla\CMS\Application\CMSApplication::getInstance() JROOT/libraries/src/Factory.php:140 1 Joomla\CMS\Factory::getApplication() JROOT/index.php:46
Query Time: 0.19 ms After last query: 0.77 ms Query memory: 0.020 MB Memory before query: 4.255 MB Rows returned: 0
SELECT `session_id`
FROM `ospsg_session `
WHERE `session_id` = X'3461616533363261376335343566626266376566656537353663343463613061' LIMIT 1id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_session NULL const PRIMARY PRIMARY 194 const 1 100.00 Using index
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.01 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.02 ms executing 0.01 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.00 ms closing tables 0.00 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 9 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 8 JDatabaseDriver->loadResult() JROOT/libraries/src/Session/MetadataManager.php:74 7 Joomla\CMS\Session\MetadataManager->createRecordIfNonExisting() JROOT/libraries/src/Application/CMSApplication.php:154 6 Joomla\CMS\Application\CMSApplication->checkSession() JROOT/libraries/src/Application/CMSApplication.php:828 5 Joomla\CMS\Application\CMSApplication->loadSession() JROOT/libraries/src/Application/CMSApplication.php:136 4 Joomla\CMS\Application\CMSApplication->__construct() JROOT/libraries/src/Application/SiteApplication.php:66 3 Joomla\CMS\Application\SiteApplication->__construct() JROOT/libraries/src/Application/CMSApplication.php:386 2 Joomla\CMS\Application\CMSApplication::getInstance() JROOT/libraries/src/Factory.php:140 1 Joomla\CMS\Factory::getApplication() JROOT/index.php:46
Query Time: 2.01 ms After last query: 0.08 ms Query memory: 0.004 MB Memory before query: 4.260 MB
INSERT INTO `ospsg_session `
(`session_id`,`guest`,`time`,`userid`,`username`,`client_id`) VALUES
(X'3461616533363261376335343566626266376566656537353663343463613061', 1, 1777105376, 0, '', 0)EXPLAIN not possible on query: INSERT INTO `ospsg_session`
(`session_id`,`guest`,`time`,`userid`,`username`,`client_id`) VALUES
(X'3461616533363261376335343566626266376566656537353663343463613061', 1, 1777105376, 0, '', 0)
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.00 ms update 0.07 ms end 0.00 ms query end 0.00 ms waiting for handler commit 1.79 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 8 JDatabaseDriverMysqli->execute() JROOT/libraries/src/Session/MetadataManager.php:116 7 Joomla\CMS\Session\MetadataManager->createRecordIfNonExisting() JROOT/libraries/src/Application/CMSApplication.php:154 6 Joomla\CMS\Application\CMSApplication->checkSession() JROOT/libraries/src/Application/CMSApplication.php:828 5 Joomla\CMS\Application\CMSApplication->loadSession() JROOT/libraries/src/Application/CMSApplication.php:136 4 Joomla\CMS\Application\CMSApplication->__construct() JROOT/libraries/src/Application/SiteApplication.php:66 3 Joomla\CMS\Application\SiteApplication->__construct() JROOT/libraries/src/Application/CMSApplication.php:386 2 Joomla\CMS\Application\CMSApplication::getInstance() JROOT/libraries/src/Factory.php:140 1 Joomla\CMS\Factory::getApplication() JROOT/index.php:46
Query Time: 0.19 ms After last query: 3.39 ms Query memory: 0.021 MB Memory before query: 4.811 MB Rows returned: 5
SELECT id, rules
FROM `ospsg_viewlevels `id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_viewlevels NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 5 100.00 NULL
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.01 ms System lock 0.01 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.02 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.00 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 10 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1506 9 JDatabaseDriver->loadAssocList() JROOT/libraries/src/Access/Access.php:1063 8 Joomla\CMS\Access\Access::getAuthorisedViewLevels() JROOT/libraries/src/User/User.php:458 7 Joomla\CMS\User\User->getAuthorisedViewLevels() JROOT/libraries/src/Plugin/PluginHelper.php:318 6 Joomla\CMS\Plugin\PluginHelper::load() JROOT/libraries/src/Plugin/PluginHelper.php:87 5 Joomla\CMS\Plugin\PluginHelper::getPlugin() JROOT/libraries/src/Plugin/PluginHelper.php:129 4 Joomla\CMS\Plugin\PluginHelper::isEnabled() JROOT/libraries/src/Application/SiteApplication.php:604 3 Joomla\CMS\Application\SiteApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:212 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.26 ms After last query: 0.09 ms Query memory: 0.021 MB Memory before query: 4.823 MB Rows returned: 1
SELECT b.id
FROM ospsg_usergroups AS a
LEFT JOIN ospsg_usergroups AS b ON b.lft <= a.lft AND b.rgt >= a.rgt
WHERE a.id = 1id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE a NULL const PRIMARY PRIMARY 4 const 1 100.00 NULL 1 SIMPLE b NULL range idx_usergroup_nested_set_lookup idx_usergroup_nested_set_lookup 4 NULL 1 100.00 Using where; Using index
Status Duration starting 0.05 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.00 ms optimizing 0.01 ms statistics 0.05 ms preparing 0.01 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.00 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 11 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1550 10 JDatabaseDriver->loadColumn() JROOT/libraries/src/Access/Access.php:980 9 Joomla\CMS\Access\Access::getGroupsByUser() JROOT/libraries/src/Access/Access.php:1095 8 Joomla\CMS\Access\Access::getAuthorisedViewLevels() JROOT/libraries/src/User/User.php:458 7 Joomla\CMS\User\User->getAuthorisedViewLevels() JROOT/libraries/src/Plugin/PluginHelper.php:318 6 Joomla\CMS\Plugin\PluginHelper::load() JROOT/libraries/src/Plugin/PluginHelper.php:87 5 Joomla\CMS\Plugin\PluginHelper::getPlugin() JROOT/libraries/src/Plugin/PluginHelper.php:129 4 Joomla\CMS\Plugin\PluginHelper::isEnabled() JROOT/libraries/src/Application/SiteApplication.php:604 3 Joomla\CMS\Application\SiteApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:212 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.23 ms After last query: 21.32 ms Query memory: 0.020 MB Memory before query: 8.241 MB Rows returned: 1
SELECT count(* )
FROM `ospsg_cwgears_schedule `id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NO INDEX KEY COULD BE USED NULL NULL NULL NULL Select tables optimized away
Status Duration starting 0.06 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms executing 0.01 ms end 0.00 ms query end 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 10 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 9 JDatabaseDriver->loadResult() JROOT/plugins/system/cwgears/cwgears.php:102 8 plgSystemCwgears->onAfterInitialise() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:668 4 Joomla\CMS\Application\CMSApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:686 3 Joomla\CMS\Application\SiteApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:212 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.18 ms After last query: 0.06 ms Query memory: 0.020 MB Memory before query: 8.247 MB Rows returned: 1
SELECT count(* )
FROM `ospsg_cwgears_schedule `
WHERE time + '3600'<'1777105376'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NO INDEX KEY COULD BE USED NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.01 ms System lock 0.00 ms optimizing 0.01 ms statistics 0.01 ms preparing 0.01 ms executing 0.01 ms end 0.00 ms query end 0.00 ms closing tables 0.00 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 10 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1740 9 JDatabaseDriver->loadResult() JROOT/plugins/system/cwgears/cwgears.php:145 8 plgSystemCwgears->onAfterInitialise() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:668 4 Joomla\CMS\Application\CMSApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:686 3 Joomla\CMS\Application\SiteApplication->initialiseApp() JROOT/libraries/src/Application/SiteApplication.php:212 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 1.92 ms After last query: 16.18 ms Query memory: 0.026 MB Memory before query: 12.072 MB Rows returned: 142
SHOW TABLES EXPLAIN not possible on query: SHOW TABLES
Status Duration checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.04 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.03 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.00 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms end 0.01 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.03 ms cleaning up 0.02 ms
# Caller File and line number 13 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1550 12 JDatabaseDriver->loadColumn() JROOT/libraries/joomla/database/driver/mysqli.php:505 11 JDatabaseDriverMysqli->getTableList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:116 10 acym_getTableList() JROOT/administrator/components/com_acym/helpers/global/addon.php:10 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.34 ms After last query: 0.46 ms Query memory: 0.034 MB Memory before query: 12.115 MB Rows returned: 132
SELECT * FROM ospsg_acym_configuration id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_configuration NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 132 100.00 NULL
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.01 ms executing 0.17 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 17 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 16 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 15 acym_loadObjectList() JROOT/administrator/components/com_acym/classes/configuration.php:21 14 AcyMailing\Classes\ConfigurationClass->load() JROOT/administrator/components/com_acym/helpers/global/global.php:37 13 acym_config() JROOT/administrator/components/com_acym/libraries/object.php:14 12 AcyMailing\Libraries\acymObject->__construct() JROOT/administrator/components/com_acym/classes/plugin.php:13 11 AcyMailing\Classes\PluginClass->__construct() JROOT/administrator/components/com_acym/libraries/joomla/extension.php:76 10 acym_loadPlugins() JROOT/administrator/components/com_acym/helpers/global/addon.php:21 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.17 ms After last query: 0.09 ms Query memory: 0.023 MB Memory before query: 12.201 MB Rows returned: 2
SELECT * FROM ospsg_acym_plugin id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_plugin NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 2 100.00 NULL
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.01 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.00 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 15 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 14 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 13 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/class.php:58 12 AcyMailing\Libraries\acymClass->getAll() JROOT/administrator/components/com_acym/classes/plugin.php:20 11 AcyMailing\Classes\PluginClass->__construct() JROOT/administrator/components/com_acym/libraries/joomla/extension.php:76 10 acym_loadPlugins() JROOT/administrator/components/com_acym/helpers/global/addon.php:21 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.17 ms After last query: 0.04 ms Query memory: 0.022 MB Memory before query: 12.210 MB Rows returned: 2
SELECT * FROM ospsg_acym_plugin id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_plugin NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 2 100.00 NULL
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.01 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.00 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 14 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 13 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 12 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/class.php:58 11 AcyMailing\Libraries\acymClass->getAll() JROOT/administrator/components/com_acym/libraries/joomla/extension.php:77 10 acym_loadPlugins() JROOT/administrator/components/com_acym/helpers/global/addon.php:21 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.21 ms After last query: 4.14 ms Query memory: 0.023 MB Memory before query: 13.563 MB Rows returned: 9
SELECT `groups`.* , `groups`.title AS text, `groups`.id AS `value`
FROM ospsg_usergroups AS `groups`id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE groups NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 9 100.00 NULL
Status Duration starting 0.03 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.01 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.02 ms executing 0.03 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 15 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 14 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 13 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/user.php:46 12 acym_getGroups() JROOT/administrator/components/com_acym/dynamics/createuser/plugin.php:21 11 plgAcymcreateuser->__construct() JROOT/administrator/components/com_acym/libraries/joomla/extension.php:118 10 acym_loadPlugins() JROOT/administrator/components/com_acym/helpers/global/addon.php:21 9 acym_trigger() JROOT/plugins/system/acymtriggers/acymtriggers.php:424 8 plgSystemAcymtriggers->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.86 ms After last query: 8.46 ms Query memory: 0.006 MB Memory before query: 15.250 MB
UPDATE `ospsg_extensions `
SET `params` = '{\"mediaversion\":\"f8725ff0f3003a56ced6d3adfe437e4d\"}'
WHERE `type` = 'library' AND `element` = 'joomla'EXPLAIN not possible on query: UPDATE `ospsg_extensions`
SET `params` = '{\"mediaversion\":\"f8725ff0f3003a56ced6d3adfe437e4d\"}'
WHERE `type` = 'library' AND `element` = 'joomla'
Status Duration starting 0.02 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.01 ms System lock 0.07 ms updating 0.18 ms end 0.01 ms query end 0.00 ms waiting for handler commit 2.44 ms closing tables 0.02 ms freeing items 0.01 ms cleaning up 0.00 ms
# Caller File and line number 14 JDatabaseDriverMysqli->execute() JROOT/libraries/src/Helper/LibraryHelper.php:117 13 Joomla\CMS\Helper\LibraryHelper::saveParams() JROOT/libraries/src/Version.php:372 12 Joomla\CMS\Version->setMediaVersion() JROOT/libraries/src/Version.php:331 11 Joomla\CMS\Version->getMediaVersion() JROOT/libraries/src/Factory.php:778 10 Joomla\CMS\Factory::createDocument() JROOT/libraries/src/Factory.php:234 9 Joomla\CMS\Factory::getDocument() JROOT/plugins/system/cwgears/cwgears.php:200 8 plgSystemCwgears->onAfterRoute() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 6 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 5 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1190 4 Joomla\CMS\Application\CMSApplication->route() JROOT/libraries/src/Application/SiteApplication.php:796 3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:218 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.56 ms After last query: 4.23 ms Query memory: 0.028 MB Memory before query: 15.868 MB Rows returned: 42
SELECT `id`,`name`,`rules`,`parent_id`
FROM `ospsg_assets `
WHERE `name` IN ('root.1','com_actionlogs','com_acym','com_admin','com_ajax','com_associations','com_banners','com_cache','com_categories','com_checkin','com_config','com_contact','com_content','com_contenthistory','com_contenttemplater','com_cpanel','com_extplorer','com_fields','com_finder','com_hitstepsanalytics','com_installer','com_ipmapping','com_jce','com_joomlaupdate','com_languages','com_login','com_mailto','com_media','com_menus','com_messages','com_modules','com_newsfeeds','com_osmap','com_plugins','com_postinstall','com_privacy','com_redirect','com_regularlabsmanager','com_search','com_tags','com_templates','com_users','com_wrapper')id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_assets NULL range idx_asset_name idx_asset_name 202 NULL 43 100.00 Using index condition
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.06 ms preparing 0.01 ms executing 0.28 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.02 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 18 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 17 JDatabaseDriver->loadObjectList() JROOT/libraries/src/Access/Access.php:429 16 Joomla\CMS\Access\Access::preloadComponents() JROOT/libraries/src/Access/Access.php:213 15 Joomla\CMS\Access\Access::preload() JROOT/libraries/src/Access/Access.php:531 14 Joomla\CMS\Access\Access::getAssetRules() JROOT/libraries/src/Access/Access.php:183 13 Joomla\CMS\Access\Access::check() JROOT/libraries/src/User/User.php:398 12 Joomla\CMS\User\User->authorise() JROOT/components/com_content/models/article.php:58 11 ContentModelArticle->populateState() JROOT/libraries/src/MVC/Model/BaseDatabaseModel.php:457 10 Joomla\CMS\MVC\Model\BaseDatabaseModel->getState() JROOT/components/com_content/models/article.php:251 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.06 ms After last query: 0.12 ms Query memory: 0.282 MB Memory before query: 15.919 MB Rows returned: 1677
SELECT `id`,`name`,`rules`,`parent_id`
FROM `ospsg_assets `
WHERE `name` LIKE 'com_content.%' OR `name` = 'com_content' OR `parent_id` = 0id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_assets NULL ALL idx_asset_name,idx_parent_id NO INDEX KEY COULD BE USED NULL NULL 3187 20.55 Using where
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.01 ms init 0.00 ms System lock 0.00 ms optimizing 0.01 ms statistics 0.04 ms preparing 0.01 ms executing 1.86 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.00 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 18 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 17 JDatabaseDriver->loadObjectList() JROOT/libraries/src/Access/Access.php:359 16 Joomla\CMS\Access\Access::preloadPermissions() JROOT/libraries/src/Access/Access.php:226 15 Joomla\CMS\Access\Access::preload() JROOT/libraries/src/Access/Access.php:540 14 Joomla\CMS\Access\Access::getAssetRules() JROOT/libraries/src/Access/Access.php:183 13 Joomla\CMS\Access\Access::check() JROOT/libraries/src/User/User.php:398 12 Joomla\CMS\User\User->authorise() JROOT/components/com_content/models/article.php:58 11 ContentModelArticle->populateState() JROOT/libraries/src/MVC/Model/BaseDatabaseModel.php:457 10 Joomla\CMS\MVC\Model\BaseDatabaseModel->getState() JROOT/components/com_content/models/article.php:251 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 1.21 ms After last query: 1.98 ms Query memory: 0.031 MB Memory before query: 17.295 MB Rows returned: 31
SHOW FULL COLUMNS FROM `ospsg_content `EXPLAIN not possible on query: SHOW FULL COLUMNS FROM `ospsg_content`
Status Duration starting 0.05 ms Executing hook on transaction 0.00 ms starting 0.02 ms checking permissions 0.00 ms checking permissions 0.00 ms Opening tables 0.30 ms init 0.01 ms System lock 0.01 ms optimizing 0.03 ms statistics 0.06 ms preparing 0.02 ms Creating tmp table 0.03 ms executing 0.04 ms checking permissions 0.03 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.04 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.03 ms checking permissions 0.02 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.02 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.01 ms checking permissions 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.02 ms cleaning up 0.02 ms
# Caller File and line number 16 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 15 JDatabaseDriver->loadObjectList() JROOT/libraries/joomla/database/driver/mysqli.php:448 14 JDatabaseDriverMysqli->getTableColumns() JROOT/libraries/src/Table/Table.php:261 13 Joomla\CMS\Table\Table->getFields() JROOT/libraries/src/Table/Table.php:180 12 Joomla\CMS\Table\Table->__construct() JROOT/libraries/src/Table/Content.php:39 11 Joomla\CMS\Table\Content->__construct() JROOT/libraries/src/Table/Table.php:328 10 Joomla\CMS\Table\Table::getInstance() JROOT/components/com_content/models/article.php:253 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 2.50 ms After last query: 1.80 ms Query memory: 0.006 MB Memory before query: 17.554 MB
UPDATE ospsg_content
SET `hits` = (`hits` + 1)
WHERE `id` = '5'EXPLAIN not possible on query: UPDATE ospsg_content
SET `hits` = (`hits` + 1)
WHERE `id` = '5'
Status Duration starting 0.03 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.00 ms Opening tables 0.03 ms init 0.01 ms System lock 0.03 ms updating 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 2.23 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
# Caller File and line number 11 JDatabaseDriverMysqli->execute() JROOT/libraries/src/Table/Table.php:1264 10 Joomla\CMS\Table\Table->hit() JROOT/components/com_content/models/article.php:254 9 ContentModelArticle->hit() JROOT/components/com_content/controller.php:113 8 ContentController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:702 7 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_content/content.php:43 6 require_once JROOT/components/com_content/content.php JROOT/libraries/src/Component/ComponentHelper.php:402 5 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 4 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 3 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 2 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.43 ms After last query: 70.26 ms Query memory: 0.024 MB Memory before query: 18.770 MB Rows returned: 1
SELECT * FROM ospsg_acym_list WHERE type = 'standard'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_list NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 1 100.00 Using where
Status Duration starting 0.10 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.05 ms init 0.01 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.02 ms preparing 0.02 ms executing 0.05 ms end 0.01 ms query end 0.01 ms waiting for handler commit 0.01 ms closing tables 0.02 ms freeing items 0.02 ms cleaning up 0.02 ms
# Caller File and line number 17 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 16 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 15 acym_loadObjectList() JROOT/administrator/components/com_acym/classes/list.php:485 14 AcyMailing\Classes\ListClass->getAllForSelect() JROOT/administrator/components/com_acym/classes/form.php:25 13 AcyMailing\Classes\FormClass->__construct() JROOT/plugins/system/acymtriggers/acymtriggers.php:175 12 plgSystemAcymtriggers->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.25 ms After last query: 0.99 ms Query memory: 0.024 MB Memory before query: 18.976 MB Rows returned: 3
SELECT * FROM ospsg_acym_field id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_field NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 3 100.00 NULL
Status Duration starting 0.03 ms Executing hook on transaction 0.01 ms starting 0.01 ms checking permissions 0.01 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.00 ms statistics 0.01 ms preparing 0.01 ms executing 0.04 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.02 ms
# Caller File and line number 17 JDatabaseDriverMysqli->execute() JROOT/libraries/joomla/database/driver.php:1701 16 JDatabaseDriver->loadObjectList() JROOT/administrator/components/com_acym/libraries/joomla/database.php:32 15 acym_loadObjectList() JROOT/administrator/components/com_acym/libraries/class.php:58 14 AcyMailing\Libraries\acymClass->getAll() JROOT/administrator/components/com_acym/classes/form.php:28 13 AcyMailing\Classes\FormClass->__construct() JROOT/plugins/system/acymtriggers/acymtriggers.php:175 12 plgSystemAcymtriggers->onBeforeCompileHead() JROOT/libraries/joomla/event/event.php:70 11 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160 10 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108 9 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:67 8 Joomla\CMS\Document\Renderer\Html\HeadRenderer->fetchHead() JROOT/libraries/src/Document/Renderer/Html/HeadRenderer.php:38 7 Joomla\CMS\Document\Renderer\Html\HeadRenderer->render() JROOT/libraries/src/Document/HtmlDocument.php:511 6 Joomla\CMS\Document\HtmlDocument->getBuffer() JROOT/libraries/src/Document/HtmlDocument.php:803 5 Joomla\CMS\Document\HtmlDocument->_renderTemplate() JROOT/libraries/src/Document/HtmlDocument.php:577 4 Joomla\CMS\Document\HtmlDocument->render() JROOT/libraries/src/Application/CMSApplication.php:1112 3 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:778 2 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:231 1 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49
Query Time: 0.27 ms After last query: 0.11 ms Query memory: 0.023 MB Memory before query: 19.006 MB Rows returned: 0
SELECT * FROM ospsg_acym_form WHERE active = 1 AND type != 'shortcode'id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE ospsg_acym_form NULL ALL NULL NO INDEX KEY COULD BE USED NULL NULL 1 100.00 Using where
Status Duration starting 0.04 ms Executing hook on transaction 0.00 ms starting 0.00 ms checking permissions 0.00 ms Opening tables 0.02 ms init 0.00 ms System lock 0.01 ms optimizing 0.01 ms statistics 0.01 ms preparing 0.01 ms executing 0.02 ms end 0.00 ms query end 0.00 ms waiting for handler commit 0.01 ms closing tables 0.01 ms freeing items 0.01 ms cleaning up 0.01 ms
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Code
Language
Translator
Run
Credits
podcast https://spotifycreators-web.app.link/e/AL9XUPbVEPb
20231003 Update! WEBEJS editor https://macmath.inf.um.es/
Check out Vernier Caliper tape 150mm measures in mm and inch Digital Ruler LCD battery included. Get it on Shopee now! https://shope.ee/2flTsKNmFN?share_channel_code=1
more worksheet: Physics_lab_Sharjah_
Worksheet 📖 ejss_model_Micrometer02 Tahani Ibrahim Ragheb AL Sarayreh physics department :Sharjah University : UAE measurment of density.docx 06 June 2020Worksheet 📖 ejss_model_Micrometer02 Tahani Ibrahim Ragheb AL Sarayreh physics department :Sharjah University : UAE measurment of density.pdf 06 June 2020Worksheet 📖 :ejss_model_Micrometer02_measurments of density 1 Nawal Nayfeh, Physics instructor at university of sharjah, UAE.pdf 25 May 2020
Worksheet 📖 :ejss_model_Micrometer02_measurments of density 1 Nawal Nayfeh, Physics instructor at university of sharjah, UAE.docx 20 May 2020
Errors, uncertainties, precision and accuracy through practical work
Learning Outcomes:
Curriculum Emphasis:
Can uncertainty be reduced or even eliminated? How do measurement uncertainties propagate to derived quantities?
Identify and discuss how errors and uncertainties arise in specific measurements and experiments that students carry out, and discuss ways to reduce the errors and uncertainties. It is also possible to discuss the concepts of precision and accuracy using the data collected.
This is a way of building on existing practical work throughout the year to reinforce students' understanding of error and uncertainty through experiential learning.
Resources:
Vernier Caliper Study Guide
Quiz
Instructions: Answer the following questions in 2-3 sentences each.
What are the three types of measurements that can be taken with a vernier caliper? Describe the function of the outside jaws on a vernier caliper. Explain the purpose of the vernier scale on a vernier caliper. What is the typical precision of a vernier caliper used in industry? How does the depth probe of a vernier caliper function? What is the purpose of the retainer on a vernier caliper? What is zero error in the context of vernier calipers, and how does it affect measurements? Explain how the main scale and vernier scale work together to provide precise measurements. Why is a vernier caliper more precise than a standard ruler? List three advantages of using a digital vernier caliper over a traditional analog one.
Quiz Answer Key
The three types of measurements are: external dimensions, internal dimensions, and depth.The outside jaws are used to measure the external dimensions of an object, such as its width or diameter.The vernier scale provides a finer level of precision than the main scale, allowing for measurements to be taken to the nearest tenth of a millimeter or even smaller increments.Vernier calipers used in industry commonly have a precision of one-hundredth of a millimeter (0.01 mm) or 10 micrometers. The depth probe is a thin rod that extends from the caliper body and is used to measure the depth of holes or recesses. The retainer is used to lock the movable jaw in place, allowing for the measured dimension to be easily transferred or compared. Zero error occurs when the jaws of the caliper are closed but the vernier scale does not align with zero on the main scale. It introduces a systematic error that needs to be accounted for in all measurements. The main scale provides the whole millimeter measurement, while the vernier scale determines the fractional part of the millimeter. The vernier scale has markings that are slightly closer together than the main scale, allowing for more precise readings.A vernier caliper is more precise because it incorporates a vernier scale that allows for measurements to be taken to fractions of a millimeter. Standard rulers typically only have markings down to the millimeter.Advantages of digital calipers: easy to read, no parallax error, can switch between metric and imperial units easily.
Essay Questions
Discuss the importance of accuracy and precision in scientific measurements. Explain how vernier calipers contribute to achieving accurate and precise measurements.
Compare and contrast the advantages and disadvantages of vernier calipers and micrometers as precision measuring tools. Provide specific examples where one tool might be preferred over the other.
Explain how to correctly read a measurement using a vernier caliper. Include a step-by-step guide, addressing the role of the main scale, vernier scale, and zero error.
Describe various applications of vernier calipers in different fields, such as engineering, manufacturing, and science. Illustrate with examples how the tool's precision is crucial in these specific contexts.
Explain the concept of zero error in vernier calipers and its impact on measurements. Describe methods to correct for zero error and ensure accurate readings.
Glossary of Key Terms
Vernier Caliper: A precision measuring instrument used to measure internal and external dimensions, as well as depth, with high accuracy.Main Scale: The primary scale on the vernier caliper, graduated in millimeters or inches.Vernier Scale: A secondary scale that slides along the main scale, enabling measurements to be taken to fractions of a millimeter or inch.Outside Jaws: The larger jaws used to measure external dimensions like width or diameter.Inside Jaws: The smaller jaws used to measure internal dimensions, such as the diameter of a hole.Depth Probe: A thin rod attached to the caliper, used for measuring depth.Retainer: A mechanism to lock the movable jaw in position, facilitating the transfer of measurements.Zero Error: An offset in the vernier scale reading when the caliper jaws are fully closed, requiring correction for accurate measurements.Precision: The degree of repeatability and consistency in a set of measurements.Accuracy: The closeness of a measured value to the true or accepted value.
Briefing Document: Vernier Caliper Simulation
Source: "Vernier Caliper App Full screen version JavaScript HTML5 Applet Simulation Model" from Open Educational Resources / Open Source Physics @ Singapore
Main Theme: The source details a free, interactive, online simulation of a Vernier caliper, designed for educational purposes. The simulation allows students to explore the workings of a Vernier caliper and practice taking accurate measurements in a risk-free virtual environment.
Most Important Ideas and Facts:
Functionality: The simulation allows users to measure both internal and external dimensions of objects. Users can manipulate the object size and position, introduce zero error, and choose from various Vernier scales. It also includes hints and answers to aid in learning.Accessibility: The simulation is built using JavaScript and HTML5, making it accessible on various devices including computers, tablets, and smartphones.Educational Goals:Understanding Vernier Caliper Components: The simulation provides a detailed breakdown of the different parts of a Vernier caliper, including the outside and inside jaws, depth probe, main scale, and Vernier scale.Accurate Measurement: Students can learn to read the Vernier scale and make precise measurements to the hundredth of a millimeter.Zero Error: The simulation allows users to introduce and understand the concept of zero error, a crucial aspect of accurate measurement using a Vernier caliper.Learning Outcomes: The simulation is aligned with the learning outcome "(g) describe how to measure a variety of lengths with appropriate accuracy by means of tapes, rules, micrometers and calipers, using a vernier scale as necessary."Additional Resources: The source provides links to:Research papers discussing the pedagogical benefits of using simulations in conjunction with physical instruments.Worksheets developed by educators to accompany the simulation.Videos demonstrating the use of both physical and simulated Vernier calipers.Mobile apps offering similar Vernier caliper simulations.
Key Quotes:
"Vernier calipers can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws, and depending on the manufacturer, depth measurements by the use of a probe [...] Vernier calipers commonly used in industry provide a precision to a hundredth of a millimetre (10 micrometres)."
"The Vernier calipers model has an object (Blue) for the internal jaws to measure width of an object with slider to control width of the object and simple drag action to control position of object."
"checkbox for hint to scaffold the learners attention and point of focus checkbox for answer to show the meaning of reading on the main scale and the vernier scale with zero error calculations if any."
Conclusion:
This online Vernier caliper simulation is a valuable resource for students learning about measurement techniques. Its interactive nature and comprehensive features provide a rich learning experience, making it an effective tool for supplementing traditional classroom instruction.
Apps
Prohttps://play.google.com/store/apps/details?id=com.ionicframework.vernierpro698620 https://play.google.com/store/apps/details?id=com.ionicframework.vernierapp777926
Free
https://itunes.apple.com/us/app/vernier-calipers-simulator/id1163657388?ls=1&mt=8
Pro
https://itunes.apple.com/us/app/vernier-calipers-simulator-pro/id1244019319?ls=1&mt=8
How to Use
General Description
This JavaScript App simulates the Vernier Caliper. The simulation shows the instrument setup with a rectangular object .
The Vernier calipers model has an object (Blue) for the internal jaws to measure width of an object with slider to control width of the object and simple drag action to control position of object.
An object (Green) for external jaws to measure internal diameter of a cylinder for example with slider to control dimensions of the cylinder.
Visual Elements
Outside jaws: used to measure external diameter or width of an object (Blue)
Inside jaws: used to measure internal diameter of an object
Depth probe: used to measure depths of an object or a hole ( not shown in this model) .
Main scale: gives measurements in mm.
Vernier gives measurements up to one decimal places in mm
Retainer: used to block movable part to allow the easy transferring a measurement ( not shown in this model)
fine control buttons for learners to manipulate the model with single incremental precision control
Vernier gives measurements up to one decimal places in mm
Controls
ComboBox 1: Sets the type of caliper scales.
ComboBox 2: Show and hide hints, answers, common objects etc
ComboBox 3: Sets the zero error
play button to run the caliper to move automatically.
reset button to bring simulaton back to original (default) setting.
?= click to toggle between combobox or input field.
combobox/inputfield to ease selecting answers like 0.00 and key in numbers.
cm/mm text click to toggle between the 2 units, centimeter and millimeter
iCTLT2016 ePosterGuide Example
{/source}
Video
VIDEO
iCTLT2016 Sample of ePoster by lookang lawrence wee
Worksheet
more worksheets: Physics_lab_Sharjah_
Worksheet 📖 ejss_model_Micrometer02 Tahani Ibrahim Ragheb AL Sarayreh physics department :Sharjah University : UAE measurment of density.docx 06 June 2020Worksheet 📖 ejss_model_Micrometer02 Tahani Ibrahim Ragheb AL Sarayreh physics department :Sharjah University : UAE measurment of density.pdf 06 June 2020Worksheet 📖 :ejss_model_Micrometer02_measurments of density 1 Nawal Nayfeh, Physics instructor at university of sharjah, UAE.pdf 25 May 2020
Worksheet 📖 :ejss_model_Micrometer02_measurments of density 1 Nawal Nayfeh, Physics instructor at university of sharjah, UAE.docx 20 May 2020
Video
https://www.youtube.com/watch?v=JsBHciYPMJI
VIDEO
https://youtu.be/zz4Fha5sISo
VIDEO
https://youtu.be/qXtE07tbK8s
VIDEO
VIDEO
https://notebooklm.google.com/notebook/11107253-c540-40c2-ada2-04a301971065/audio
GIF
https://3.bp.blogspot.com/-p0SadXZAkzo/V1Yg5C07E6I/AAAAAAAA37g/CFiB0StCka0jlQHUIFW-OsvKwJRAO12YgCLcB/s640/vernier.gif
Version:
http://weelookang.blogspot.com/2018/09/vernier-caliper-javascript-html5-applet.html added external, internal and depth measurements by Fu-Kwun Hwang and lookanghttp://weelookang.blogspot.sg/2015/07/ejss-vernier-caliper-model.html by Fu-Kwun Hwang and lookang JavaScript version blogposthttp://weelookang.blogspot.sg/2010/06/ejs-open-source-vernier-calipers-java.html by Fu-Kwun Hwang and lookang Java version blogposthttp://iwant2study.org/lookangejss/01_measurement/ejs/ejs_model_AAPTVernierCaliper.jar by Fu-Kwun Hwang and lookang OSP@SG digital library copyhttp://www.opensourcephysics.org/items/detail.cfm?ID=9707 by Fu-Kwun Hwang and lookang first Open Source Physics catalog itemhttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1408.0 by Fu-Kwun Hwang with different measure jaws optionshttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=684.0 by Fu-Kwun Hwang and lookang remix Java versionhttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=567.0 by Fu-Kwun Hwang with zero errors
Other Resources
http://physci.kennesaw.edu/html5/tm-vernier.html by Taha Mzoughi https://3dwarehouse.sketchup.com/model.html?id=8d9c6f18404cb75dc918062ff9c5ac49 https://www.geogebra.org/m/jybrnwgp by Seng kwang
Developer notes
Simulation completed on 4 Nov:
1. Vernier Caliper
- enlarged the dragme objects on the bottom scale (yellow) and bottom object (blue) to help make the dragging easier on smaller mobile screen
- added "mm" on top scale
- added checkAndroid for fullscreen
- removed bug for initial tail values (yellow) when measuring depth. (so that yellow tail won't "pierce" through the pink container.
Vernier Caliper Simulator FAQ
1. What is the Vernier Caliper Simulator?
This interactive JavaScript app replicates a Vernier caliper, a tool used for precise length measurements. It features a simulated caliper with internal and external jaws, sliders to adjust object dimensions, and controls to introduce zero error. The simulator aids in understanding how to read a Vernier caliper and perform accurate measurements.
2. What are the key features of the Vernier Caliper Simulator?
The simulator boasts several features, including:
Adjustable object dimensions and positions for internal and external measurements.
A zero error slider to practice real-world measurement scenarios.
Hints and answer options to guide learners.
A dropdown menu for selecting different Vernier caliper scales.
Fine control buttons for precise adjustments.
A reset button for default settings.
3. How do I use the simulator?
The interface is user-friendly. You can:
Select the desired caliper scale from the dropdown menu.
Use sliders to manipulate the object size and zero error.
Utilize fine control buttons for incremental adjustments.
Toggle between hints, answers, and other visual aids.
Reset the simulator to default settings.
4. What educational goals does the simulator support?
The simulator aims to achieve the following learning goals:
Understanding the parts of a Vernier caliper and their functions.
Mastering the technique of reading measurements from the main scale and Vernier scale.
Calculating measurements accurately, including adjustments for zero error.
Developing proficiency in using Vernier calipers for internal, external, and depth measurements.
5. What are the educational benefits of using the simulator?
The Vernier Caliper Simulator offers several advantages for learners:
Interactive and Engaging: The visual and hands-on nature of the simulator makes learning about measurement tools more captivating.Risk-Free Practice: Students can experiment without the risk of damaging real instruments or encountering potential hazards.Immediate Feedback: The simulator provides instant feedback on measurements, allowing for self-correction and understanding.Accessibility: Being a web-based tool, it offers access to learning resources anytime, anywhere.
6. Is the Vernier Caliper Simulator free to use?
Yes, the simulator is an Open Educational Resource (OER), meaning it is freely available for anyone to use and modify.
7. Are there versions for mobile devices?
Yes, the simulator is designed to work on various devices, including smartphones, tablets, laptops, and desktop computers.
8. Where can I find additional resources related to Vernier calipers?
The webpage hosting the simulator contains links to additional resources, including videos, worksheets, and other simulations, to further enhance understanding and practice.
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Fu-Kwun Hwang; lookang
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