While the repair shop works on your voltmeter, they loan you anunusual replaceme

Question

While the repair shop works on your voltmeter, they loan you anunusual replacement: Rather than measuring the potential differenceacross a resistor, it measures the amount of charge that flowed,and the change in electric potential energy of that charge. You usethe device on a resistor and it tells you that 2.5 C of chargeflowed through it, and that the electric potential energy of thatcharge decreased by 0.40 J. What is the potential differenceacross the resistor? (Report the answer as a positive number.)

Explanation / Answer

The potential difference across the resistor is V=W/Q where W: Work Q: Charge through resistor V=0.4/2.5=0.16V

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