An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.

Energy used by electric heater $=600\ kJ=600\times10^3\ J$

Time $t=5\ minutes=5\times60\ s=300\ seconds$

Therefore, power $=\frac{energy\ used}{time}$

$=\frac{600\times10^3\ J}{300\ s}$

$=2\times10^3\ Watt$

$=2\ kW$    [As $1\ kilo-watt=10^3\ Watt$]

Therefore, the power rating of the heater is $2\ kWh$.

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Updated on: 10-Oct-2022

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