Question

An electric bulb of 100w is used for 4 hours a day in joules and killowatt hour unit.​

Answer 1

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Answer 2

Given

Power of bulb = 100 W

Consumption time t = 4 hours

To determine the consumption unit in kW h =?

Consumption = 100 × 4 = 400 W h

We know 1 kW = 1000 W

Thus consumption = (400/1000) = 0.4 kW h