Calculating Power Loss from Voltage Change at 3 Ohms Resistance

[urszula]

Homework Statement

a power station delivers 520kW of power to a factory through wires of total resistance of 3 ohms ,how much less power is wasted if the electricity is deliverd at 50,000V rather than 12,000V

Homework Equations

P=IV=I^R =V^/R

The Attempt at a Solution

I tried to use voltage and resistance to calculate power and compare that with 520kW ,but it did not make any sense.Please help me.

 

[Vijay Bhatnagar]

Determine the current flowing at 12000 V and 520 kW. Power wasted I^2R. Next determine the current at 50000 V and 520 kW (it will be much less than earlier). Determine power wasted. Find the difference.

 

[urszula]

Thanks a lot .