Apparent power is the vector sum of real (P) and reactive (j
Q) AC power
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).
While both the volt-ampere (abbreviated VA) and the watt have the dimension of power (time rate of energy), they do not have the same meaning. 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 (400 kVA) at 220 volts can deliver a current of 1818 amperes.
- ^ Ciletti, M. D., Irwin, J. D., Kraus, A. D., Balabanian, N., Bickard, T. A., and Chan, S. P. (1993). Linear circuit analysis. In Electrical Engineering Handbook, edited by R. C. Dorf. Boca Raton: CRC Press. (pp.82–87)
- ^ IEEE 100 : the authoritative dictionary of IEEE standards terms.-7th ed. ISBN 0-7381-2601-2, page 23
- ^ Watt Ratings Differs From Volt Amp Ratings APC
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Sun, 16 Jun 2013 13:56:45 -0700
Divisional railway manager of Pune division Vishal Agarwal said, “Six trains heading towards Mumbai were delayed by two hours after a 24 Kilo-Volt-Ampere (KVA) high-tension wire came down on the railway track. The MSEDCL officials were immediately ...
The Portugal News
Thu, 13 Jun 2013 14:48:28 -0700
... launched by the DGEG in October 2010 to boost the public electric grid with renewable energy from solar plants. The Algarve was allocated a goal of generating 30 MVA (Mega Volt Ampere), through 15 plots to be located in Silves, Albufeira and Loulé.
Business Wire (press release)
Thu, 13 Jun 2013 06:27:21 -0700
Moreover, the system can enhance grid reliability by helping balance the grid through frequency regulation, volt-ampere reactive (VARs) compensation, and demand response services. The system is scheduled to be operational by the fall of 2013. Standard ...
Tue, 11 Jun 2013 09:07:23 -0700
"In the last one-year, the company has added 152 MVA (Mega Volt Ampere) of capacity in its network in West Delhi. In the next two months - till July 31, BRPL will be adding another 230 MVA of network capacity in its network in West Delhi," the BRPL ...
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Wed, 22 May 2013 15:15:28 -0700
The second four-year phase will bring advanced technologies, among them volt and volt-ampere reactive control and decentralised power. In the third phase, from 2023 to 2030, the country will install micro-grids, advanced load management and other ...
Tue, 21 May 2013 04:40:27 -0700
The company will launch a range of inverter-battery back-up in the range of 1,000VA (volt-ampere) and above for industries, commercial locations such as malls, hotels etc where diesel consumption is soaring due to growing need of power. "We are trying ...
Tue, 18 Jun 2013 11:13:33 -0700
Kelompok pelanggan rumah tangga 450 volt ampere (VA) dan 900 VA yang 39,18 juta pelanggan diperkirakan menerima subsidi listrik terbesar, yaitu mencapai Rp 40,14 triliun atau 51 persen dari total subsidi. KOMPAS/PRIYOMBODO. Petugas rekanan PT ...
Sat, 25 May 2013 01:42:45 -0700
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