Choose the correct option.

1 kWh is equal to:

Assume we have a machine that consumes 1000 J of energy per second. This machine will consume 1 kWh of energy if used continuously for one hour.

Thus, $1\mathrm{kW}$h is the energy used in one hour at the rate of $1000J{s}^{-1}$ (or $1\mathrm{kW}$ ).

$1\mathrm{kWh}=1\mathrm{kW}\times 1\mathrm{h}$

            $=1000W\times 3600s$

             $=$$3600000J$

$1\mathrm{kWh}=3.6\times {10}^6\mathrm{J}$