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In science, electrical energy is measured in joules.

However, another unit of electrical energy, the kilowatt.hour (kW.h), is the amount of energy that is used by a load of exactly one kilowatt running for exactly one hour.

The kW.h unit is used to measure the total amount of energy used in a building (a home, an office, a factory, etc.) over a particular period of time, usually one month or three months.

The owner of the building must pay for any energy used, so the power utility company sends a bill to charge the owner for the total number of kW.h units used within the last month or three months.

Several different units are used to measure electricity:

Electric charge is measured in coulombs (C)

Electric current is measured in amperes (A), amps for short

Electric potential difference (voltage) is measured in volts (V)

Electric power is measured in watts (W)

Electrical energy used is measured in kilowatt.hours (kW.H)

The units most pertinent to consumers are probably kilowatt.hours, voltage and wattage.

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