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[′vōlt ′am‚pir]
The unit of apparent power in the International System; it is equal to the apparent power in a circuit when the product of the root-mean-square value of the voltage, expressed in volts, and the root-mean-square value of the current, expressed in amperes, equals 1. Abbreviated VA.



a unit of full power of an alternating current, designated by VA. The full power of an alternating current is defined as the product of the effective values of the current in a circuit (in amperes) and the voltage at its terminals (in volts). The effective values of the current and voltage are measured by AC ammeters and voltmeters . The concept of full power is distinct from the real power of an electric circuit, which is expressed in watts and equals UI cos φ where φ is the angle of displacement of the phases between voltage U and current I, and as distinct from the reactive power, equal to UI sin φ and expressed in vars.

References in periodicals archive ?
InformationWeek recognized Southern Company for its success on GenVARR(TM) (Generator Volt Ampere Reactive Reserve).
He explained that the power station has three engines, running running on 2500 Kilo Volt Amperes (KVA), 810KVA and 2.
Medium" power transformers have a capacity of from 10 to 100 million volt amperes (MVA).