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25_Chapter 18 HomeworkCH18 Direct-Current Circuits

25_Chapter 18 HomeworkCH18 Direct-Current Circuits -...

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Direct-Current Circuits 123 18.38 (a) The equivalent resistance of the parallel combination is 1 1 1 2 3 1 1 1 1 1 1 15 150 25 50 eq R R R R = + + = + + = so the total current supplied to the circuit is 120 V 8.0 A 15 total eq V I R = = = (b) Since the appliances are connected in parallel, the voltage across each one is 120 V V = . (c) 120 V 0.80 A 150 lamp lamp V R = I = = (d) ( ) ( ) 2 2 2 120 V 5.8 10 W 25 heater heater V R = × = = P 18.39 From ( ) 2 V R = ∆ ( ) P , the resistance of the element is ( ) 2 2 240 V 19.2 3 000 W
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