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Question

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


A

200 unit

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B

0.4 unit

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C

0.6 unit

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D

400 unit

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Solution

The correct option is B

0.4 unit


50 W = 0.05 kW

Time=8hrs
Energy consumed= Power×time

= 0.05 kW×8 hrs= 0.4 kWh = 0.4 unit


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