The electrical energy used in households, industries and commercial establishments is usually expressed in which of the following units?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Kilowatt hour
The joule is too small for everyday use, so electrical energy is measured in the kilowatt hour (kWh), the energy used in one hour at a rate of 1 kW; 1 kWh = 3.6 × 106 J and is called one ‘unit’ on electricity bills. The watt and the kilowatt are units of power, not of energy.