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Heating Effect of Electric Current

If 2.2 kilowa...

Question

If 2.2 kilowatt power is being transmitted at 44 KV on a 20 $Ω$ line, then power loss will be :

A

0.1 watt

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B

1.4 watt

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C

100 watt

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D

0.05 watt

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Solution

The correct option is D 0.05 watt
$I = \frac{P}{V} = \frac{2200}{44000} = \frac{1}{20} A$
Power loss = $I^{2} R = (\frac{1}{20})^{2} 20 = 0.05 W$

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