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Answer Posted / kiran kumar cheruku
Volt-ampere (VA) is a measurement of power in a direct
current ( DC ) electrical circuit. The VA specification is
also used in alternating current ( AC ) circuits, but it is
less precise in this application, because it represents
apparent power , which often differs from true power
In an AC circuit, power and VA mean the same thing only
when there is no reactance . Reactance is introduced when a
circuit contains an inductor or capacitor . Because most AC
circuits contain reactance, the VA figure is greater than
the actual dissipated or delivered power in watts. This can
cause confusion in specifications for power supplies. For
example, a supply might be rated at 600 VA. This does not
mean it can deliver 600 watts, unless the equipment is
reactance-free. In real life, the true wattage rating of a
power supply is 1/2 to 2/3 of the VA rating
The VA figure is nominally 1.67 times (167 percent of)
the power consumption in watts. Alternatively, you can
multiply the VA rating of the power supply by 0.6 (60
percent) to get a good idea of its power-delivering
capability in watts.
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