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Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

G (giga)
a prefix indicating a quantity of 109. For instance, a gigabyte (GB) of storage is 1;000;000;000 (typically implemented as 230) bytes.
G-line
a line of the mercury spectrum corresponding to a wavelength of about 436 nm.
gain
(1) the ratio of the output variable of a device to its input variable. For calculation purposes, the dimensionality of the gain is simply the unit of the output variable divided by the unit of the input variable. The gain of a device is a dimensionless value only when the electrical units of both the input and output variables are the same (e.g., voltage gain, current gain, power gain, etc.). In this case, a gain greater than one indicates an increase from input to output, while a value for gain less than one is indicative of a decrease (or attenuation). The overall gain of several cascaded components is found by multiplying the individual gains of each component in the system. Gain is often expressed in decibels to facilitate calculation of cascaded gains in a system. decibel

(2) the ratio of the radiation intensity of a particular antenna to that of an isotropic radiator, in the same direction and at the same distance.
gamma-ray laser
laser producing its output in the gamma-ray region of the spectrum, often considered to be any wavelength below about 0.1 angstrom; graser, not yet demonstrated.
ganged
operation of a multiple phase device with all phases operated simultaneously.
gapless arrester
a lightning arrester which is distinguished from a gapped arrester by having a continuous conductive path between the conductor and ground.
gapped arrester
a lightning arrester whose conducting path contains a gas-or air-filled spark gap which must be broken down by the lightning impulse voltage.
gas cable
an electric power cable which is pressurized with an insulating gas, typically sulfur hexaflouride, for its primary insulation.
gas capacitor
a capacitor whose dielectric is composed of a high-pressure gas, often nitrogen or an electronegative gas such as sulfur hexaflouride.
gas circuit breaker
a circuit breaker in which the arc between the contacts is extinguished by immersion in or a blast of an electronegative gas.
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