If 20 joules of work is used to transfer 20 coulombs of charge through a 20 ohm resistor, the potential difference across the resistor is what?

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I got the solution. The answer is V=w/q=20J/20C=1c

The answer = 1 V. because the equation for Potential difference is work done over the charge it has passed through between two points. So V = W/q.

Now as we know the formula for the potential difference we can simply calculate the potential drop across the resistor by plugging in the values.

From this we get V = 20/20 so the answer comes out to be 1 Volt. Or 1 V. Hope this helps. Good luck