A kilowatt-hour (kWh) is one kilowatt of power being used for one hour. It is the amount of energy used by a 40-watt light bulb if it were left on for 24 hours. We also call it a ‘unit’ of energy.

A kilowatt-hour (kWh) is one kilowatt of power being used for one hour. It is the amount of energy used by a 40-watt light bulb if it were left on for 24 hours. We also call it a ‘unit’ of energy.

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