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**[SOLVED] Potential Change in a Circuit Diagram**

## Homework Statement

http://personalpages.tds.net/~locowise/test/28_29.gif

If the potential at point P is 400 V, what is the potential at point Q?

## Homework Equations

Ohm's Law: deltaV=iR

Probably the fact that the sum of changes in potential in a loop of any circuit must be zero.

## The Attempt at a Solution

Not real sure on this problem. I tried this:

150V - 2.0i - 3.0i - 50V = 0V and found i to be 20A.

I'm kind of puzzled and can't seem to relate the material in the textbook to this problem. Where does the 400V potential come into play? Thanks for your help!

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