volt ampere
Sign in to saveAlso known as VA, V·A, volt-ampere, voltampere
The volt-ampere (SI symbol: VA, sometimes V⋅A or V A) is the unit of measurement for apparent power in an electrical circuit. It is the product of the root mean square voltage (in volts) and the root mean square current (in amperes). Volt-amperes are usually used for analyzing alternating current (AC) circuits. In direct current (DC) circuits, this product is equal to the real power, measured in watts. The volt-ampere is dimensionally equivalent to the watt: in SI units, 1 V⋅A = 1 W. VA rating is most used for generators and transformers, and other power handling equip
Key facts
- Unit.name
- volt-ampere
- Unit.image
- Cmplxpower.svg
- Unit.caption
- Apparent power (
- Unit.standard
- SI units
- Unit.quantity
- Apparent power
- Unit.symbol
- V⋅A
- Unit.units1
- SI base units
- Unit.inunits1
- 1 kg⋅m2⋅s−3
via Wikipedia infobox
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- wd:Q550341 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
- conversion to SI unit
- 1
- unit symbol
- V·A
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Article
4 sectionsContents
- Formulation
- Usage
- Volt-ampere reactive {{anchor|Reactive}}
- References
The volt-ampere (SI symbol: VA, sometimes V⋅A or V A) is the unit of measurement for apparent power in an electrical circuit. It is the product of the root mean square voltage (in volts) and the root mean square current (in amperes). Volt-amperes are usually used for analyzing alternating current (AC) circuits. In direct current (DC) circuits, this product is equal to the real power, measured in watts. The volt-ampere is dimensionally equivalent to the watt: in SI units, 1 V⋅A = 1 W. VA rating is most used for generators and transformers, and other power handling equipment, where loads may be reactive (inductive or capacitive).
== Formulation == For a simple electrical circuit running on direct current, the electrical current and voltage are constant. In that case, the real power (P, measured in watts) is the product of the current (I, measured in amperes) and the voltage from one side of the circuit to the other (V, measured in volts): P = I \cdot V