Question

Kilowatt-hour is the unit of ______.

Options

• energy

• power

• linear momentum

• none of these

Answer 1

Kilowatt-hour is the unit of energy.

Explanation: 

A kilowatt-hour is the energy used when a power of 1 kilowatt works for 1 hour.

Energy = Power × Time

1 kWh = 1000 W × 3600 s

1 kWh = 3.6 × 10⁶ J

Therefore, kilowatt-hour is a unit of energy, not power.