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Q.

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 Ω The power loss in the wire is

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a

19.2 kW

b

19.2W

c

19.2 J

d

12.2 kW

answer is B.

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Detailed Solution

Total resistance R=0.5Ω/km×150km=75ΩTotal voltage drop =8V/km×150km=1200 V Power loss =ΔV2R=1200275W

=19200W=19.2 k.W

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