Question

Define kilowatt hour and convert it into joules.

Answer 1

A kilowatt hour (kWh) is the electrical energy consumed when a device of power 1 kilowatt operates for 1 hour.

1 kWh = 1 kW × 1 h

= 1000 W × 3600 s

= 1000 J/s × 3600 s

= 3.6 × 10⁶ J