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'Electricity' is not a quantity, so cannot be measured and, therefore, has no unit of measurement. It is the name of a field of study, just like 'chemistry', etc.

A 'unit' of electrical energy is short for 'Board of Trade Unit' (a former government organisation that, at one time, set energy prices in the UK), and is exactly equivalent to a kilowatt hour, which is defined as the amount of energy consumed, over a period of one hour, at a rate of one kilowatt. A unit or kilowatt hour is equal to 3.6 million joules (a joule being the SI unit for energy), and normally costs around £0.15 to buy.

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Q: What is the practical unit of electricity?
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