W<\/em> = 1 Nm or joule.<\/p>\n\n\n\nThus, when a force of 1 N applied on the body moves it to a distance of 1 m, the work done on the body is said to be 1 Nm or joule.<\/p>\n\n\n\n
1.26 MECHANICAL POWER<\/h5>\n\n\n\n The rate of doing work or the amount of work done per unit time is called power, <\/strong>that is,<\/p>\n\n\n\nUnit: <\/strong>The unit of mechanical power is Newton metre per second (i.e., Nm\/s) or joule\/second (i.e., J\/s).<\/p>\n\n\n\nHowever, the practical unit of mechanical power is horse power.<\/p>\n\n\n\n
In fact, the rate of doing 75 <\/em>kg <\/em>m of work per second is known as one horse power.<\/p>\n\n\n\n1.27 HEAT ENERGY<\/h5>\n\n\n\n The form of energy which produces a sensation of warmth is called heat.<\/p>\n\n\n\n
Mathematically,<\/p>\n\n\n\n
Heat,<\/p>\n\n\n\n
<\/p>\n\n\n\n
H<\/em> = m S <\/em>\u03b8<\/em><\/p>\n\n\n\nWhere<\/p>\n\n\n\n
<\/p>\n\n\n\n
m<\/em> = mass of the body;<\/p>\n\n\n\nS<\/em> = specific heat of the body; and<\/p>\n\n\n\n\u03b8<\/em> = rise or fall in temperature.<\/p>\n\n\n\nUnit: <\/strong>The unit of heat is kilocalorie (kcal)<\/p>\n\n\n\nIf, m<\/em> = 1 kg; \u03b8<\/em> = 1\u00b0C, and S<\/em> = 1, that is, specific heat of water.<\/p>\n\n\n\nThen, H<\/em> = 1 kcal<\/p>\n\n\n\nHence, the amount of heat required to raise the temperature of 1 <\/em>kg of water through 1\u00b0C is called one kilocalorie.<\/p>\n\n\n\nHowever, the smaller unit of heat energy is calorie.<\/p>\n\n\n\n
One calorie is defined as the amount of heat required to raise the temperature of 1 gram of water through 1\u00b0C.<\/p>\n\n\n\n
<\/p>\n\n\n\n
1 kilocalorie = 1000 calories<\/p>\n\n\n\n
1.28 JOULES LAW OF ELECTRICAL HEATING<\/h5>\n\n\n\n Joule (James Prescott Joule) established that there exists a definite relation between electrical energy expended and amount of heat produced. Thus, the relation is called Joule\u2019s law of electrical heating.<\/p>\n\n\n\n
This law stated that the amount of heat produced (H) is directly proportional to the electrical energy expended (W).<\/p>\n\n\n\n
That is,<\/p>\n\n\n\nWhere J is a constant called mechanical equivalent of heat and its value is determined as 4.18 <\/em>joule per calorie (i.e., 1 calorie = 4.18 joule). It means that to produce one calorie of heat, 4.18 J of electrical energy is expended.<\/p>\n\n\n\nFrom equation (1.8), we get,<\/p>\n\n\n\nwhere I <\/em>2<\/sup>Rt<\/em> is the electrical energy in joule.<\/p>\n","protected":false},"excerpt":{"rendered":"When a body, to which force is applied, moves in or opposite direction of the applied force, work is said to be done by or against the body. Mathematically, Work = Force \u00d7 distance or W = F \u00d7d Unit: The unit of work is Newton metre (Nm) or joule. If, F = 1 N and d = 1 m; then, W = 1 […]<\/p>\n","protected":false},"author":1,"featured_media":2211,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[403],"tags":[],"class_list":["post-2535","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-concepts-of-circuit-theory"],"jetpack_featured_media_url":"https:\/\/workhouse.sweetdishy.com\/wp-content\/uploads\/2024\/08\/thermodynamics-1.png","_links":{"self":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/2535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/comments?post=2535"}],"version-history":[{"count":1,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/2535\/revisions"}],"predecessor-version":[{"id":2536,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/posts\/2535\/revisions\/2536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/media\/2211"}],"wp:attachment":[{"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/media?parent=2535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/categories?post=2535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/workhouse.sweetdishy.com\/index.php\/wp-json\/wp\/v2\/tags?post=2535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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