19_Chapter 18 HomeworkCH18 Direct-Current Circuits

19_Chapter 18 HomeworkCH18 Direct-Current Circuits - 117...

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Direct-Current Circuits 117 (b) The total power input to the circuit is () ( ) 12 1.50 V 1.50 V 0.600 A 1.80 W input I εε =+ = + = P ( ) 2 2 0.600 A 0.255 0.153 0.147 loss Ir r =+ = + Ω = P Thus, the fraction of the power input that is dissipated internally is W 0.147 W 0.0816 or 8.16% 1.80 W loss input == P P 18.25 Applying Kirchhoff’s junction rule at junction a gives (1) Using Kirchhoff’s loop rule on the upper loop yields III ( 3 ) ( ) 13 .0 4.0
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This document was uploaded on 10/20/2011.

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