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## Homework Statement

The circuit [http://tinypic.com/r/2cwl7bt/9] shows a battery connected across a uniform resistor R

_{0}. A sliding contact can move across the resistor from x = 0 at the left to x = 10 cm at the right. Find an expression for the power dissipated in the resistor R as a function of x. Plot the function for E = 50 V, R = 2000 Ω, and R

_{0}= 100 Ω.

[Note: picture embedded by moderator]

## Homework Equations

[/B]

P = V

^{2}R = i

^{2}R = iV

P = energy/time

## The Attempt at a Solution

I really do not know where to begin. My professor did not explain how to approach problems involving sliding contacts. I tried to use the second equation because it involved the variable time, which I figured I could somehow relate to the distance x. Any help would be appreciated.