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Electrical appliances and devices use different amounts of energy each second, as indicated by their power rating.
Power is a measure of the amount of energy used by or supplied to a device in one second.
Power is measured in watts (W).
Multiplying power of a device in kilowatts (kW) by time in hours (h) gives us the energy used in kilowatt–hours (kWh).
Electricity bills are based on the amount of energy units used; 1 unit of energy is equal to 1 kWh.