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Electric Circuits 8th Edition 104

Electric Circuits 8th Edition 104 - voltage source and a...

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80 Simpt€ R€sistjve Circuits Curr€trt division is a circuit analysis tool that is used to find the cunent through a single resistanceftom a col- lection of paiallefconnected resistances when t]Ie cur- ient into ttre collection is kno$n: R"" , j _ p . , where ir is the curent thmugh the iesistance Rj and i is the current into the parallel-connected resistances whose equivalent resistance is Req. (See page 66 ) A voltmeter measures voltage and must be placed in par- allel with the voltage being measuled. An ideal vollmeter has infinite inlemal resistance and tlus doesnot alter tlle voltage being measured. (See page 68.) Digital met€rs and analog meterc have intemal resisG ance,which influences ttre value of the circuit variable beins measured. Meters based on the d'Arsonval meter mov;ment detbemtely include internal rcsistance as a way to limit t]le current in the movemenf's coil. (See page 68.) The Wh€atstone bddg€ circuit is used to male precise measuements of a rcsistoi's value using four resistors, a dc
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Unformatted text preview: voltage source, and a galvanometer' A Wheatstone biidge js balanced when the resjstors obey Eq. 3 33, resulting in a galvanometer reading of 0 A. (See page 71.) . A circuit with three resistors connected in a A configu-ration (or a ?]' configuiation) can be transformed into an equivalent circuit in which the ttrree resistors are Y con-nected (or T connected). The A-to-Y transformation is given by Eqs.3.44-3.46; the Y-to-A hansformation is given by Eqs. 3.47-3.49. (See page 74.) . An ammeter measurcs current and must be placed in series with the curent being measured.An ideal amme-ter has zero internal rcsistance and thus does not alt€r the current beingmeasured. (See page 68.) Problems Sections 3.1-32 3,1 For each of the circuits shown, a) identify the resistors connected in serieq Figure P3.1 b) simplify the circuit by replacing ttre series-connected resiston with equivalent resistors. 3ko 8ko 5ko 4 0 0 4 5 0 soo :ov( ) 3oo 60f) 10v 240 {l 1800 300 () 140 0 200 ()...
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