An electric bulb of rating 50 W is used for 8 hours in one day. Find the number of units of energy used by the electric bulb.

200 unit

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0.4 unit

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0.6 unit

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400 unit

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Solution

The correct option is B
0.4 unit

Given, power = 50 W = 0.05 kW
So, energy consumed :

0.05 $\times$ 8 h = 0.4 kWh = 0.4 unit.

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