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 W. The power loss in the wires is:(a) 19.2 W(b) 19.2 kW(c) 19.2 J(d) 12.2 kW
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Total voltage drop across wire = 150 × 8
= 1200V
Total resistance of wire
= 150 × 0.5 = 75 Ω
∴ current through wire
I=VR=120075=16 Ampere
∴ Power loss = I²R
= (16)2 × 75
= 19200 W
= 19.2 kW
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