The energy consumed by 100 W electric bulb in 5 hours is:

0.5 k W h

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1.5 k W h

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5 k W h

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2.5 k W h

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Solution

The correct option is A $0.5 k W h$
Given, power of the electric bulb,
$P = 100 W = (100 / 1000) k W = 0.1 k W$ ;
time for which bulb is used, $t = 5 h$
As $P = \frac{W}{t}$ or $W = P t$
or $W = 0.1 k W \times 5 h = 0.5 k W h$

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