16_Ch 18 College Physics ProblemCH18 Direct-Current Circuits

16_Ch 18 College Physics ProblemCH18 Direct-Current...

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114 CHAPTER 18 18.19 (a) Applying Kirchhoff’s loop rule, as you go clockwise around the loop, gives ( ) ( ) ( ) 20.0 V 2 000 30.0 V 2 500 25.0 V 500 0 II +− −− I = , or 3 3.00 10 A 3.00 mA I = (b) Start at the grounded point and move up the left side, recording changes in potential as you go, to obtain ( )( ) ( )( ) 33 20.0 V 2 000 3.00 10 A 30.0 V 1000 3.00 10 A A V =+ × × or 19.0 V A V =− (c) () ( )( ) 3 1500 1 500 3.00 10 A 4.50 V V ∆= Ω× = (The upper end is at the higher potential.) 18.20 Following the path of from a to b , and recording changes in potential gives
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