Glossaries | edulabs.org academy

Sunday, 28 April 2024, 1:27 AM

Site: edulabs.org academy

Course: Activity Examples (Activity Examples)

Glossary: Electronics (Mike Jaroch)

DIRECT CURRENT

An electric current that flows in one direction only [1].

DIRECT SHORT

Same as SHORT CIRCUIT [3].

DIRECTIONAL ANTENNA

An antenna that radiates most effectively in only one direction [18].

DIRECTIONAL COUPLER

A device that samples the energy traveling in a waveguide in one direction
only [11].

DIRECTIVITY

The ability of an antenna to radiate or receive more energy in some directions than in others. The degree of sharpness of the antenna beam [10] [11] [18].

DIRECTLY HEATED CATHODE

A wire, or filament, designed to emit the electrons that flow from
cathode to plate. The filament is designed so that a current is passed through it; the current heats the filament to the point where electrons are emitted [6].

DIRECTOR

The parasitic element of an array that reinforces energy coming from the driver element [10].

DISCRETE COMPONENTS

Individual transistors, diodes, resistors, capacitors, and inductors [14].

DISCRIMINATOR

A circuit in which amplitude variations are derived in response to phase or frequency variations [18].

DISPERSION

The refraction of light waves that causes the different frequencies to bend at slightly different angles [10].