{"id":3730,"date":"2023-01-09T10:24:40","date_gmt":"2023-01-09T10:24:40","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3730"},"modified":"2024-11-29T04:03:16","modified_gmt":"2024-11-29T04:03:16","slug":"s-11-c-rate-of-doing-work","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-11-c-rate-of-doing-work\/","title":{"rendered":"S-11.c Rate Of Doing Work"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Rate Of Doing Work<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\"><strong>Key Notes<\/strong>:<\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-d3258f3846ea246b9082140e2169b3df\" style=\"color:#000060\"><strong>Definition of Work<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Work is done when a force is applied to an object, and the object moves in the direction of the force.<\/li>\n\n\n\n<li>Formula: W = F \u00d7 d \u00d7 cos\u2061 \u03b8 where:\n<ul class=\"wp-block-list\">\n<li>W is work,<\/li>\n\n\n\n<li>F is force,<\/li>\n\n\n\n<li>d is displacement,<\/li>\n\n\n\n<li>\u03b8 is the angle between force and displacement.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-6b590319acd96dd5764e823355f4a313\" style=\"color:#000060\"><strong>Rate of Doing Work<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>The rate at which work is done is called <strong>power<\/strong>.<\/li>\n\n\n\n<li>Power measures how quickly or slowly work is performed.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-9adc797549b4afe083a850d8b3e11b69\" style=\"color:#000060\"><strong>Definition of Power<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Power is defined as the amount of work done per unit time.<\/li>\n\n\n\n<li>Formula: P = W\/t\n<ul class=\"wp-block-list\">\n<li>P is power,<\/li>\n\n\n\n<li>W is work done,<\/li>\n\n\n\n<li>t is the time taken.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-f9a48045fd413264a544fbb734969ae7\" style=\"color:#000060\"><strong>Unit of Power<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>The SI unit of power is the <strong>watt (W)<\/strong>.<\/li>\n\n\n\n<li>1\u2009watt = 1\u2009joule \/ second&nbsp;(J\/s)<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-24109e3c10e73b8dea8a831ba93b388a\" style=\"color:#000060\"><strong>Larger Units of Power<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li><strong>Kilowatt (kW)<\/strong>: 1\u2009kW = 1000\u2009W.<\/li>\n\n\n\n<li><strong>Horsepower (hp)<\/strong>: 1\u2009hp \u2248 746\u2009W.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-53e8556e8686b3ecb2b863ce90bc913f\" style=\"color:#000060\"><strong>Energy and Power<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Power is closely related to energy transfer.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center has-large-font-size\"><strong>Energy&nbsp;transferred = Power \u00d7 Time<\/strong><\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-6ddae5027470dd0ab100b4170f082f17\" style=\"color:#000060\"><strong>Practical Examples<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>A person climbing stairs at different speeds demonstrates different rates of doing work.<\/li>\n\n\n\n<li>Electrical appliances like bulbs and motors have power ratings that indicate the energy they consume per unit time.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-a324b2ffe944ec528fa3caf5a5f20b76\" style=\"color:#000060\"><strong>Relation to Efficiency<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Power and work are used to calculate the efficiency of machines, which is given by:<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"85\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-24.png\" alt=\"\" class=\"wp-image-15933\" style=\"width:416px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-24.png 620w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-24-300x41.png 300w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/figure><\/div>\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-f615e44dc58be295fbc69c0149596912\" style=\"color:#000060\"><strong>Graphical Representation<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-large-font-size\">Work versus time graphs can help visualize power, as the slope of the graph gives the power.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-a9806279cecf1bd65349762bb7ec9748\" style=\"color:#000060\"><strong>Factors Affecting Power<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>The amount of work done.<\/li>\n\n\n\n<li>The time taken to do the work.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-393a4b8abea486ac52ee307675e66f42\" style=\"color:#d90000\"><strong>Let&#8217;s practice!<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/59486\/627\/979\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-2-51.png\" alt=\"\" class=\"wp-image-10530\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-2-51.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-2-51-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-2-51-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/81561\/503\/652\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-1-1-54-1.png\" alt=\"\" class=\"wp-image-10531\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-1-1-54-1.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-1-1-54-1-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/10\/Worksheet-1-1-1-54-1-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n<\/div>\n<p><!-- \/wp:post-content --><\/p>","protected":false},"excerpt":{"rendered":"<p>Rate Of Doing Work Key Notes: Definition of Work: Rate of Doing Work: Definition of Power: Unit of Power: Larger Units of Power: Energy and Power: Energy&nbsp;transferred = Power \u00d7 Time Practical Examples: Relation to Efficiency: Graphical Representation: Factors Affecting Power: Let&#8217;s practice!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3730","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3730"}],"version-history":[{"count":15,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3730\/revisions"}],"predecessor-version":[{"id":16248,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3730\/revisions\/16248"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}