1. The problem statement, all variables and given/known data Determine the heat loss in the circuit that is connected in series with two batteries (12 V and 6V) and two resistors (6ohms and 4 ohms). 2. Relevant equations 3. The attempt at a solution I used the difference in P = V^2/R, the power dissipated in the circuit, to calculate the heat loss. Heat energy loss/t = (12^2/6) - (6^2/4) = 15W. Apparently, I am incorrect; but I don't know the right direction to solve this problem. Thanks in advance for your guidance/help.