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Apparent power is the vector sum of real (P) and reactive (jQ) AC power vectors

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.[1] In direct current (DC) circuits, this product is equal to the real power (active power) [2] 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.[3]

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.

## References

1. ^ 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)
2. ^ IEEE 100 : the authoritative dictionary of IEEE standards terms.-7th ed. ISBN 0-7381-2601-2, page 23
3. ^

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 Heavy showers spare no mode of transport Daily News & Analysis 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 ... Solar plant given green light 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. Standard Solar Commits to Clinton Global Initiative for Innovation and Growth ... 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 ... Long power outages continue in Delhi Business 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 ... Power Engineering International Power Engineering International Power Engineering International 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 ... Economic Times Luminous Power Technologies to venture into commercial power back-up market Economic Times 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 ... KOMPAS.com Sistem Mahakam Pulih, Listrik Kembali Menyala di Balikpapan, Samarinda, dan ... KOMPAS.com 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 ... Calo Listrik Masih Ada JPNN.com Sat, 25 May 2013 01:42:45 -0700 PLN juga telah menentukan tarif resmi harga instalasi pemasangan baru yaitu Rp 750 per volt ampere (VA) untuk pelanggan 450 VA-2.200 VA. Sedangkan untuk pelanggan di atas 2.200 VA tarifnya Rp 775 per VA.. “Jadi untuk pemasangan rumahan yang ...
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