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# Velocity factor

The velocity factor (VF), also called wave propagation speed or velocity of propagation (VoP or v_\mathrm), of a transmission medium is the ratio of the speed at which a wavefront (of an acoustic signal, for example, or an electromagnetic signal, a radio signal, a light pulse in a fibre channel or a change of the electrical voltage on a copper wire) passes through the medium, to the speed of light in a vacuum. [1]

The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the USA.

## Capacitance

Capacitance is the ability of a body to store an electrical charge.

## Category 5 cable

Category 5 cable, commonly referred to as cat 5, is a twisted pair cable for carrying signals.

## Coaxial cable

Coaxial cable, or coax (pronounced), is a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.

## Computer network

A computer network or data network is a telecommunications network which allows computers to exchange data.

## Copper wire and cable

Copper has been used in electric wiring since the invention of the electromagnet and the telegraph in the 1820s.

The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.

## Henry (unit)

The henry (symbol H) is the unit of electrical inductance in the International System of Units.

## Inductance

In electromagnetism and electronics, inductance is the property of an electrical conductor by which a change in current flowing through it induces an electromotive force in both the conductor itselfSears and Zemansky 1964:743 and in any nearby conductors by mutual inductance.

## Metre per second

Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds.

## Multiplicative inverse

In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x&minus;1, is a number which when multiplied by x yields the multiplicative identity, 1.

## Nanosecond

A nanosecond (ns) is an SI unit of time equal to one billionth of a second (10 or 1/1,000,000,000 s).

## Plenum cable

Plenum cable is cable that is laid in the plenum spaces of buildings.

## Propagation delay

Propagation delay is a technical term that can have a different meaning depending on the context.

## Refractive index

In optics the refractive index or index of refraction n of an optical medium is a dimensionless number that describes how light, or any other radiation, propagates through that medium.

## Relative permittivity

The relative permittivity of a material is its dielectric permittivity expressed as a ratio relative to the permittivity of vacuum.

## Signal velocity

The signal velocity is the speed at which a wave carries information.

## Speed of electricity

The word electricity refers generally to the movement of electrons (or other charge carriers) through a conductor in the presence of potential and an electric field.

## Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics.

## Speed of sound

The speed of sound is the distance travelled per unit time by a sound wave propagating through an elastic medium.

## Square root

In mathematics, a square root of a number a is a number y such that, in other words, a number y whose square (the result of multiplying the number by itself, or) is a. For example, 4 and −4 are square roots of 16 because.

## Telegrapher's equations

The telegrapher's equations (or just telegraph equations) are a pair of coupled, linear differential equations that describe the voltage and current on an electrical transmission line with distance and time.

## Transmission line

In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to carry alternating current of radio frequency, that is, currents with a frequency high enough that their wave nature must be taken into account.

## Transmission medium

A transmission medium is a material substance (solid, liquid, gas, or plasma) that can propagate energy waves.