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    Question

    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 :-
    A 10.2 kW Correct Answer Incorrect Answer
    B 14.2 kW Correct Answer Incorrect Answer
    C 23.04 kW Correct Answer Incorrect Answer
    D 20.2 kW Correct Answer Incorrect Answer

    Solution

    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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