1. The problem statement, all variables and given/known data Two resistors of resistances R1 and R2 , with R2>R1 , are connected to a voltage source with voltage V0 . When the resistors are connected in series, the current is Is . When the resistors are connected in parallel, the current Ip from the source is equal to 10Is Let r be the ratio R1/R2 Find r 2. Relevant equations 3. The attempt at a solution First I found an expression for voltage in each circuit and then equated them to give me Is*(R1+R2) = 10Is*((R1*R2)/(R1+R2)) Although from here I'm kind of stuck. I'm not sure how to, or even if I am able to manipulate my equation to get R1/R2. Unfortunately it seems my algebra is letting me down in a lot of physics work.