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What is a kWh?

The basic unit of electricity is the Kilowatt hour (kWh). In simple terms, 1 kWh is the amount of energy used by a 1kW (1000 watt) electric heater for 1 hour. Another example is ten 100-watt light bulbs used for 1 hour.

As a guide, the diagram below shows how long you can use various appliances for the price of one unit of electricity.

chart showing how long it takes to use 1 kilowatt of electricity by appliance
These figures give an average usage guide. Actual usage will depend on the age and efficiency of appliances.
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