1 kWh is equal to A) 3.6 ×106 MJ B) 3.6 × 105 MJ C) 3.6 × 102 MJ D) 3.6 MJ

Answer: (D) 3.6 MJ

Explanation: Simply explained, a kilowatt (kW) is a unit of power, and a kilowatt hour (kWh) is the amount of time that a kW may be used. One thousand watts sustained for one hour is one kilowatt hour.

1kWh = 1kW × 1hour

1kWh = 1000 × 60 × 60

1kWh = 3.6 × 10⁶ J

1kWh = 3.6 MJ

Hence the correct answer is D.