Find energy in kWh consumed in 10 hours by four devices of power $500 W$ each?

10 k W h

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20 k W h

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30 k W h

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40 k W h

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Solution

The correct option is B $20 k W h$
Power consumed by each device, $P = 500 W = 0.50 k W$
Time, $t = 10 h$
We know,
Energy consumed, $W = P \times t$
Energy consumed by each device, $W = 0.50 \times 10 = 5 k W h$
Energy consumed by four devices, $= 4 \times 5 = 20 k W h$

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