GCSE Combined Science · key term

Kilowatt-hour

Definition

A unit of energy equal to the energy transferred by a power of 1 kW sustained for 1 hour. $1\text{ kWh}=3.6\times10^6\text{ J}$ .

Used by OCR

Specification P5.1d · Physics Paper 2

Household appliances can transfer millions of joules, so electricity use is commonly measured in kilowatt-hours (kWh). One kilowatt-hour is the energy transferred by a power of 1 kW operating for 1 hour.
Revise: Calculating Energy Changes

Physics, Combined Science

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

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1 kWh = 3.6 \times 1 0^{6} J

Kilowatt-hours are simply more convenient for the large transfers involved in domestic electricity use.