1.

Two cirties are 75 km apart . Electric power is sent from one city to another city through copper wires. Resistance per km is 0.5 Omega. The power loss in the wire is

Answer»

19.2 W.
19.2 k W.
19.2 J.
12.2 KW.

Solution :
Potential gradient = `(dV)/(dI)=-8 V/km`
TOTAL fall in potential from cone city to another city
`V= -8xx150 =- 1200 V `
Total resistance in the wire
`R=0.5xx150=75 OMEGA`
The power loss in the wire
`P =(("Voltage loss")^(2))/(R) = ((1200)^(2))/(75 ) = 19200` W
P = 19.2 kW


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