7_Ch 18 College Physics ProblemCH18 Direct-Current Circuits

7_Ch 18 College Physics ProblemCH18 Direct-Current Circuits...

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Direct-Current Circuits 105 18.4 (a) The current through this series combination is ( ) 12 V 2.0 A 6.0 bc bc V I R = = = ( Therefore, the terminal potential difference of the power supply is ) ( ) 2.0 A 9.0 6.0 30 V eq V I R = = Ω + = (b) When connected in parallel, the potential difference across either resistor is the voltage setting of the power supply. Thus, ( )( ) 9 9 0.25 A 9.0 2.3 V V I R = = = 18.5 (a) The equivalent resistance of the two parallel resistors is
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