Define kilowatt-hour and convert it into joules?

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Solution

Kilowatt hour definition
One kilowatt-hour is equal to the work done or energy consumed when a device of power 1 kW is used for 1 hour.
The SI symbol for kilowatt-hour is kWh.
Conversion of kilowatt-hour into joules
We know,
$E l e c t r i c e n e r g y = P o w e r \times T i m e 1 k W h = 1 k W \times h r = 1000 W \times 1 h r (1 k W = 1000 W) = 1000 W \times 1 \times 60 \times 60 s (1 h r = 1 \times 60 \times 60 s) = 1000 \times 3600 J (W \times s = J) = 3600000 J = 3.6 \times 10^{6} J$
Hence, $1 k W h = 3.6 \times 10^{6} J .$

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