1. The problem statement, all variables and given/known data A power station delivers 620kW of power at 12,000 V to a factory through wires with total resistance 3.0 ohms. How much less power is wasted if the electricity is delivered at 50,000V rather than 12,000V? b]2. Relevant equations[/b] P=IV=I^2R=V^2/R V=IR 3. The attempt at a solution So I know you need to find the current in order to be able to do this, but I'm a bit confused about when the different formulas for P can be used. The answer is 7500W. I tried finding the current through the wire (12kV): 12kV = I(3 ohms) = 4000A and the power lost to heat: (4000)^2 * 3 = 4.8 x 10^7 W And the current through the wire (50kV): 50kV = I (3ohms) = 16666.67A and the power lost to heat: (16666.67)^2 * 3 = 8.3 x 10^8 W but these powers don't subtract to the answer. I'm not sure I understand the problem.