First slide
Electrical power

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 



Distance between two cities = 150 km

Resistance of the wire, R = (0.5 Ωkm-1) (150 km) = 75 Ω

Voltage drop across the wire 

V = (8 V km-1) (150 km) = 1200 V

Power loss in the wire is 

P=V2R=(1200 V)275Ω=19200 W=19.2 kW


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