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1. The problem statement, all variables and given/known data

The resistances in the figures A and B are all 7.0 ohms, and the batteries are ideal 13 V batteries.

When switch S in figure b is closed, what is the change in the electric potential VR1 across resistor 1?

2. Relevant equations

I know that in figure A if S is closed the change in electric potential across R1 is 0. How does the addition of R3 in figure B change this fact?

Ohm's Law: V=iR

3. The attempt at a solution

I'm not really sure where to begin. I thought the change in electric potential in figure B would be 0 as well. Anybody care to enlighten me?

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# Homework Help: Change in Electric Potential

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