Question 666: Current Electricity

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 $$\Omega $$. The power loss in the wire is

Accepted Answer

Total voltage drop across the wire :  V = 150 ÃÂ 8= 1200 volt
Total resistance of wire, (R)Ã¢ÂÂ=Ã¢ÂÂ150Ã¢ÂÂÃÂÃ¢ÂÂ0.5Ã¢ÂÂ=Ã¢ÂÂ75 $$\Omega $$
Hence, current through wire
I = V/R
$$ \Rightarrow $$ I = 1200/75 =16 A
Finally the power loss will be,
P = I
2
R = (16)
2
ÃÂ 75
= 19200 W or 19.2 kW

Answer

19.2 W

Answer

19.2 kW

Answer

19.2 J

Answer

12.2 kW

Current Electricity

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 $\Omega $. The power loss in the wire is

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