V
Volts. The SI unit of electrical difference. One volt is the difference in potential between two points of a conducting wire carrying a constant current of one ampere when the power dissipated between these two points is equal to one watt

VA
Volt-Ampere. A designation of power in terms of volts and amperes

VAR
A unit of reactive power that means volt-amperes, reactive

Varmeter
An instrument used by power companies to measure the kvar consumption

V Band
A band of frequencies between 46 and 56 gigaHertz

VC
Varnished-cambric insulation

VDE
Association of German Electrical Engineers

Velocity of Propagation
The transmission speed of an electrical signal down a length of cable compared to its speed in free space. Usually expressed as a percentage

VG
Carnished-glass or nylon braid, 600V or 3,000V, 130ºC

VHF
Very High Frequency. The band extending from 30 to 300 MHz (television channels 2 to 13 and most FM radio) as designated by the Federal Communications Commission

Video Pair Cable
A transmission cable containing lowloss pairs with an impedance of 125 ohms. Used for TV pick ups, closed-circuit TV, telephone carrier circuits, etc.

Viscosity
Internal friction or resistance to flow of a liquid: the constant ratio of shearing stress to rate of shear

VLF
Very Low Frequency. The band extending from 10 to 30 kHz, as designated by the Federal Communications Commission

Voice Frequency (VF)
Describes an analog signal within the range of transmitted speech, typically supported by an analog telecommunications circuit

Voice Pair Cable
A transmission cable containing lowloss pairs with an impedance of 125 ohms. Used for TV pick ups, closed-circuit TV, telephone carrier circuits, etc.

Volt
A unit of electrical "pressure". One volt is the amount od pressure that will cause one ampere of current to flow through one ohm of resistance

Voltage
Electrical potential or electromotive force expressed in volts

Voltage Breakdown
A test determine the maximum voltage insulated wire can withstand before failure

Voltage, Corona Extinction
The minimum voltage that sustains corona, determined by applying a corona producing voltage, then decreasing the voltage until corona is extinct

Voltage Divider
A network consisting of impedance elements connected in series to which a voltage is applied and from which one or more voltages can be obtained across any portion of the network

Voltage Drop
The voltage developed across a conductor by the current and the resistance or impedance of the conductor

Voltage, Induced
A voltage produced in a conductor by a change in magnetic flux linking that path

Voltage Standing Wave Ratio (VSWR)
The ratio of the maximum effective voltage to the minimum effective voltage measured along the length of a mismatched radio frequency transmission line

Voltage to Ground
The voltage between an energized conductor and the earth

Volume Resistivity
The resistance in ohms of a body of unit length and unit cross-sectional area

Vulcanization
A chemical reaction in which the physical properties of a polymer are changed by reacting it with crosslinking agents

VW-1
Vertical wire flame test. Formerly designated as FR-1. A UL fire rating for single conductor cables. The test is described in UL Standard 1581