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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 ?
4 km single circuit on double circuit towers transmission line from Namo to Boun Neua; (ii) a 20 mega volt ampere new substation (transformer feeder) in Boun Neua; (iii) a new 115kV switching station in Namo; (iv) approximately 361 km 22 kV feeders from the Boun Neua substation for related medium and low voltage distribution; and (v) necessary connection from the Boun Neua substation to 2,645 households.
The works comprises of supplying, installing, testing and commissioning of the two transmission substations with the capacity of 400/132 KV, each of them contains 4 transformers with the capacity of 505 Mega Volt Ampere.
Its rating for continuous operation is 247 Mega Volt Amperes (MVA).
He explained that the power station has three engines, running running on 2500 Kilo Volt Amperes (KVA), 810KVA and 2.