AIPMT | 2014Current Electricity and Electrical InstrumentMedium
Question
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
Options
A.19.2 W
B.19.2 kW
C.19.2 J
D.12.2 kW
Solution
Resistance = 150 × 0.5 = 75 Ω
I =
= 16 A
P = I2R = (16)2 × 75 W = 19200 = 19.2 kW
I =
= 16 AP = I2R = (16)2 × 75 W = 19200 = 19.2 kW
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