1. The problem statement, all variables and given/known data Find a resistance, RL, to replace R3, that will draw maximum power from the sources 2. Relevant equations RL=RTH 3. The attempt at a solution Am I correct in saying if I set R3 to be Rth of the whole circuit, it would draw maximum power? I calculated based on that 1/(1/(120+680) +1/(820+330)) = 471.1 Ohm Rth I am not sure if I should have included the 100Ohm resistor(R3) in the calculation or not.