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

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#### Solution

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

`P=W/T`

Where,

Power rating of the device, *P* = 500 W = 0.50 kW

Time for which the device runs, *T* = 10 h

Work done = Energy consumed by the device

Therefore, energy consumed = Power × Time

= 0.50 × 10 = 5 kWh

Hence, the energy consumed by four equal rating devices in 10 h will be 4 × 5 kWh = 20 kWh = 20 Units.

Concept: Rate of Doing Work

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