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runfast220
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Homework Statement
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
Homework Equations
R=V/I
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?