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ICSE Class 8 Physics Question 8 of 18

Household Electricity — Question 9

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Question

Question 9

If an appliance of power P watt is used for time t hour, how much electrical energy is consumed in kWh?

Answer

Power = P watt or P x 10-3 kW

time = t hour

Power = EnergyTime\dfrac{\text{Energy}}{\text{Time}}

Energy = Power x time
= P x 10-3 kW x t h
= P x t x 10-3 kWh

Electrical energy consumed = Pt x 10-3 kWh.