var

A unit of reactive power of an alternating current, the product of volts times amperes, = 1 watt. From volt ampere reactive.

The var was recommended as the practical unit of reactive power by the Advisory Committee on Nomenclature of the International Electrotechnical Commission at a meeting in Stockholm in 1930.

International Electrotechnical Commission.
Recommendations in the field of quantities and units used in electricity. (1st ed.)
IEC Publication 164.
Geneva, 1964.

Page 27.

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