WAEC - Physics (2015 - No. 36)

An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.
120 w
360 w
720 w
2400 w

Explanation

Power - IV

I = \(\frac{P}{V}\)

= \(\frac{12000}{2000}\)

I = 6A

Power loss = I\(^2\)R = 6\(^2\) x 20

= 720 W

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