Define a kilowatt hour. How is it related to joule

Define a kilowatt hour. How is it related to joule?

Answer

One kilowatt hour is the energy spent/ or work done by a source of power 1kW in one hour (1000 W in 3600 s) Or it is the work done when 1 kW power is consumed for one hour or any statement to this effect.

1kW h = 3.6 x 10⁶ J or 1 kW h = 3.6 M J