- Deep ThoughtLv 51 decade agoFavorite Answer
Reactive power is measured in volt-amperes-reactive (VAr, usually pronounced var). A VAr is the reactive power equivalent of one watt (W) of real electric power. A kilovolt-ampere-reactive (kVAr, pronounced kilovar) is equal to one thousand VAr and a megavolt-ampere-reactive (MVAr, pronounced megavar) is equal to one million VAr.
Reactive power corresponds to current that flows in quadrature phase to real power in alternating current circuits. Reactive power flows back and forth between the power source and the load at the frequency of the alternating current, but delivers no net power to the load. Reactive power is a major concern in the design and management of large electric power networks.
- An electric power engineerSource(s): AC Power at http://en.wikipedia.org/wiki/AC_power
- 1 decade ago
The definition of active power (megawatts) and reactive power (megavars).
Reactive Power - The portion of electricity that establishes and sustains the electric and magnetic fields of alternating-current equipment. Reactive power must be supplied to most types of magnetic equipment, such as motors and transformers. It also must supply the reactive losses on transmission facilities. Reactive power is provided by generators, synchronous condensers, or electrostatic equipment such as capacitors and directly influences electric system voltage. It is usually expressed in kilovars (kvar) or megavars (Mvar).
- 1 decade ago
To add to the previous answers:
To measure VAr, kVAr, MVAr in a circuit. A wattmeter or kWh meter with the current or voltage coil reversed will register volt amps reactive or kVAhrs reactive.