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AirForceOne

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## Homework Statement

A power station delivers 750 kW 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 50,000 V rather than 20,000 V?

## Homework Equations

P = IV = (I^2)(R) = (V^2)/R

## The Attempt at a Solution

The answer is P_dissipated = (I^2)(R) = ((P^2)(R)/(V^2), but can anyone tell me why I can't use P = (V^2)/R? I think there's a gap in my understanding.