This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...heat created we make use of the following relation (where J is Joule's dynamical equivalent of heat, i.e. 4.2 joules per w.gm.C. unit of heat). &V=JH and hence T, JH K = lt But the experiment shows that-is constant and equal R. Now EJH "t"Pi.-.-., -is constant and equals R. '. JH = RPt. i.e. for the same conductor we ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...heat created we make use of the following relation (where J is Joule's dynamical equivalent of heat, i.e. 4.2 joules per w.gm.C. unit of heat). &V=JH and hence T, JH K = lt But the experiment shows that-is constant and equal R. Now EJH "t"Pi.-.-., -is constant and equals R. '. JH = RPt. i.e. for the same conductor we have the following: --Joule's Law.--The heat generated in a given conductor is directly proportional to the square of the current, and to the time the current passes, and to the resistance of the conductor. If the current is in amperes, the resistance in ohms, and the time in seconds, the heat created is zRi joules. If the current is in absolute units, the resistance in absolute units, and the time in seconds, the heat created is i2Ri ergs. Now it takes 4.2 joules to create 1 w.gm.CV unit of heat. Hence the heat created is '2Rr . w.gm.C. un1t, 4.2 1.e..24 z'2Rr w.gm.C." unit. In a resistance of R ohms through which a current z amperes is passing, heat is created at the rate of z'2R joules per sec.; i.e. the power given out in the conductor is z'2R watts. To maintain this, energy must be supplied or work done at the rate of z'2R watts. From this point of view the resistance of a conductor may be measured by the power required to maintain a current of 1 ampere in it--this power being required on account of the property the conductor possesses of absorbing energy when a current is passing through it, and this property may be defined as the resistance of the conductor. The practical unit of resistance would be that resistance which required a power of I watt to maintaii1 a current of I ampere; i.e. a power of I joule per sec. to maintain 1 ampere; i.e. a conductor on which 1 joule of work is done when 1 ampere passes for one...
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