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Commonly used terms in the Electrical industry.

V-V transformer

See open-delta transformer

vacuum capacitor

a capacitor with a vacuum between its plates.

vacuum circuit breaker

a power circuit breaker where a vacuum chamber is used as an insulating and arc clearing medium.

vacuum insulation

any insulation scheme which depends upon the dielectric capabilities of a high vacuum.

vapor cooling

a cooling technique for power vacuum tubes utilizing the conversion of hot water to steam as a means of safely conducting heat from the device and to a heat sink.

VAR

See volt-ampere-reactive

varactor

a reverse biased PN or Schottky diode that uses the voltage variable depletion region as a tuning element or as a nonlinear frequency multiplier.

varactor diode

a diode designed to have a repeatable and high capacitance vs. reverse voltage characteristic. A two terminal semiconductor device in which the electrical characteristic of primary interest is the voltage dependent capacitance.

varactor tuner

a tuning circuit at the input of a television receiver that uses a varactor diode. The tuning capability comes from the characteristic of a varactor, or varicap, to function as a voltage-sensitive capacitance.

variable frequency drive

electric drive system in which the speed of the motor can be varied by varying the frequency of the input power.