An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if...

JAMB 2008

An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generator is 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?

A. 11:1
B. 1:11
C. 12:11
D. 11:12

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Correct Answer: Option A

Explanation

Power supplied = I\(^2\) R = 20\(^2\) X 1 = 400 W
Power dissipated = IV = 20 X 220 = 4400 W
(Power supplied)/Power dissipated = 4400 W / 400 W
= 11 / 1 or 11 : 1

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