Two cities are 125 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 9.6 volt and the average resistance per km is 0.5 Ω. the power loss in the wires is :-
Resistance = (0.5 Ω/km) x (125 km) = 62.5Ω Total voltage drop = 9.6 (V/km) x (125 km) = 1200 V Power loss = (△ v)2/R = (1200)2/62.5 = 23040 W = 23.04 kW
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