1. The problem statement, all variables and given/known data A battery is connected across a uniform resistor R0. A sliding contact can move across R0 from x=0 to x=10cm at the right. Moving the contact changes how much resistance R is to the left of the contact and how much is to the right. Find the rate at which energy is dissipated in R as a function of x. 2. Relevant equations Energy dissipated: PR=i2R Voltage is the same for resistors in parallel 1/Rtotal=1/R+1/R0 itotal=V/Rtotal 3. The attempt at a solution I tried to express R in terms of x and R0, but I got stuck. I honestly have no idea how to begin, or even if all of the equations that I wrote above are relevant to this question. Could someone please give me a hint that'll point me in the right direction? Thanks!