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Find the energy consumed in $10 hours$ by four devices of power $500 W$ each.

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5 kWh

10 kWh

15 kWh

20 kWh

answer is D.

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Detailed Solution

The energy consumed by four equal rating devices in

10 hours

will be

20 kWh

Energy consumed by an electric device can be obtained with the help of the expression for power,

P = \frac{W}{T}

Work done (W) = energy consumed by the device

Energy consumed(W)

= Power (P) \times Time (t)

Power,

P = 500 W

Power of

4

devices

= 4 \times 500 W

Convert watt into Kilowatt
The given value is divide by

1000

= 2000 W

= \frac{2000}{1000}

= 2 kW

Energy consumed by

4

devices,

E = P \times t

\Rightarrow E = 2 kW \times 10 h

\Rightarrow E = 20 kWh

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