Kilowatt-hour (kWh)

Definition

A unit of energy equal to the energy transferred by a 1 kW appliance operating for one hour.

Used by OCR

Specification P7.1d · Paper 2 (Foundation), Paper 4 (Higher)

Home electricity use is often measured in kilowatt-hours (kWh) because a joule is small compared with the energy an appliance uses over hours.
Revise: Energy calculations

1
A kilowatt-hour is a unit of energy, not power. Use kilowatts and hours together, or watts and seconds together.

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GCSE Physics · key term

A unit of energy equal to the energy transferred by a 1 kW appliance operating for one hour.

Used by OCR

Specification P7.1d · Paper 2 (Foundation), Paper 4 (Higher)

Home electricity use is often measured in kilowatt-hours (kWh) because a joule is small compared with the energy an appliance uses over hours.
Revise: Energy calculations

1
A kilowatt-hour is a unit of energy, not power. Use kilowatts and hours together, or watts and seconds together.

Create a free account to read GCSE Physics revision notes for your exam board and track your progress.