Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.
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 x Time
= 0.50 x 10 = 5 kWh
Hence, the energy consumed by four equal rating devices in 10 h will be 4 x 5 kWh = 20 kWh = 20 Units.
