Question

5 bulbs of 20W are used for 10 hours a day along with two 100w bulbs for 5hours. Calculate the amount of electrical energy consumed in one day by all the bulbs.​

Answer 1

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Electric energy consumed= Time× Power

Energy consumed by 5 bulbs of 20W in a day= 20×10= 0.2 KWh

Energy consumed by 2 bulbs of 100W in a day= 100×5= 500= 0.5 KWh

Total energy consumed= 0.2+0.5= 0.7KWh

So energy consumed in a day is 0.7 KWh

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Answer 2

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Electric energy consumed= Time× Power

Energy consumed by 5 bulbs of 20W in a day= 20×10= 0.2 KWh

Energy consumed by 2 bulbs of 100W in a day=

100×5= 500= 0.5 KWh

Total energy consumed= 0.2+0.5= 0.7KWh

So energy consumed in a day is 0.7 KWh.

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