1. The problem statement, all variables and given/known data Replace resistor R with a voltage source such that no power is absorbed by either resistor; draw the circuit, indicating the voltage polarity of the new source. 2. Relevant equations Ohm's law, Power = IV = I^2 * R 3. The attempt at a solution I'm honestly not too sure how to begin the problem. The total voltage across the circuit should add up to zero, so I'm guessing the new voltage source must be 12V, but that seems too simple. Thanks for the help.