Question

 1-Kilowatt power was transmitted through a transmission line at 1100 Volts. If transmission line has a resistance of 5 ohm, then power loss due to heat will be approximately:

Answer 1

The current in the transmission line

$$I=\frac{P}{V}=\frac{1000\:\rm W}{1100\:\rm V}=0.909\:\rm A$$

The power loss due to heat in the transmission line

$$P'=I^2R=\rm (0.909\: A)^2*5\:\Omega=4.13\: W$$