While the repair shop works on your voltmeter, they loan you an unusual replacem

Question

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

Explanation / Answer

given charge flowing through resistor = Q = 2.5c electric potential energy = W = 0.40J    W = VQ V = W/Q = 0.40J/2.5c = 0.16v

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