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A Unit is a measure of energy used in billing.

A Watt is a measure of power, which is how fast energy is converted.

Energy equals power times time, so 1 watt for 1 second defines 1 Joule of energy.

A Unit is a kilowatt-hour of energy, so 1000 watts for 3600 seconds, 3.6 million Joules.

Another Answer

A 'unit' is derived from the expression, 'Board of Trade Unit'. The Board of Trade was the now-defunct Government body which regulated energy prices in the UK. A unit is exactly equivalent to a kilowatt hour, the unit of measurement of energy used by utility companies to charge consumers.

A 'watt' is used to measure the rate at which energy is delivered, and is equivalent to a joule per second (where the joule is the SI unit of measurement for energy).

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