1. The problem statement, all variables and given/known data A resistor has a resistance R, and a battery has an internal resistance r. When the resistor is connected across the battery, ten percent less power is dissipated in R than there would be if the battery had no internal resistance. Find the ratio r/R 2. Relevant equations R=V/I 3. The attempt at a solution I really have no idea how to even start this problem. Looking at the problem all I can figure out is that R>r. Can anyone point me in the right direction to solve?