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- Q550341 subject Q7163132.
- Q550341 abstract "A volt-ampere (VA) is the unit used for the apparent power in an electrical circuit, equal to the product of root-mean-square (RMS) voltage and RMS current. In direct current (DC) circuits, this product is equal to the real power (active power) in watts. Volt-amperes are useful only in the context of alternating current (AC) circuits (sinusoidal voltages and currents of the same frequency).Some devices, including uninterruptible power supplies (UPSs), have ratings both for maximum volt-amperes and maximum watts. The VA rating is limited by the maximum permissible current, and the watt rating by the power-handling capacity of the device. When a UPS powers equipment which presents a reactive load with a low power factor, neither limit may safely be exceeded. For example, a (large) UPS system rated to deliver 400,000 volt-amperes at 220 volts can deliver a current of 1818 amperes.The volt-ampere is not an SI unit. This is because even if reactive or apparent, the quantity the unit represents is power, and SI is a coherent system that does not use different units for the same quantity in different contexts.".
- Q550341 thumbnail Cmplxpower.svg?width=300.
- Q550341 wikiPageWikiLink Q11651.
- Q550341 wikiPageWikiLink Q124164.
- Q550341 wikiPageWikiLink Q12457.
- Q550341 wikiPageWikiLink Q132629.
- Q550341 wikiPageWikiLink Q159241.
- Q550341 wikiPageWikiLink Q1930258.
- Q550341 wikiPageWikiLink Q193972.
- Q550341 wikiPageWikiLink Q207527.
- Q550341 wikiPageWikiLink Q207696.
- Q550341 wikiPageWikiLink Q223323.
- Q550341 wikiPageWikiLink Q25236.
- Q550341 wikiPageWikiLink Q25428.
- Q550341 wikiPageWikiLink Q630369.
- Q550341 wikiPageWikiLink Q7163132.
- Q550341 wikiPageWikiLink Q750454.
- Q550341 comment "A volt-ampere (VA) is the unit used for the apparent power in an electrical circuit, equal to the product of root-mean-square (RMS) voltage and RMS current. In direct current (DC) circuits, this product is equal to the real power (active power) in watts.".
- Q550341 label "Volt-ampere".
- Q550341 depiction Cmplxpower.svg.