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If a lamp of 120 W is used for 7 h per day, then how many units of energy consumed in one day by the lamp?

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0.42

0.84

answer is D.

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Detailed Solution

Power of electric bulb = 120 W = 0.12 kW.

Time used, t = 7 h

Energy = power × time taken

= 0.12 kW × 7 h

= 0.84 kW h = 0.84 units

The energy consumed by the bulb in one day is 0.84 units.

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