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Accessory (position) - Refers to the position of the key in the ignition switch; A wire showing 12 Volts (+) when in this position.
Acoustics - The study of sound. The science of production, effects, and transmission of sound waves through various mediums and the effects of absorption, diffraction, interference, reflection, and refraction.
Alternating Current (AC) - An electric current that reverses direction at regular intervals. Measured in Volts AC at Hertz, example: 110 volts AC 60 Hz.
American Wire Gauge (AWG) - A standard of the dimensional characteristics of wire used to conduct electrical current or signals. AWG is identical to the Brown and Sharpe (B & S) wire gauge.
Ammeter - An instrument that measures the magnitude of an electric current in amperes.
Ampere (amp) - A unit that defines the rate of flow of electricity (current) in a circuit.
Amplification - The increase in signal level, amplitude or magnitude.
Amplifier - 1 A device which increases the level of a signal by increasing the current or voltage. 2 May also be used to isolate or control a signal and even decrease the level as in a line output converter.
Amplifier, Power - An amplifier designed for driving loudspeakers and having a higher power output than a line amplifier or preamplifier.
Amplitude - The maximum value of a periodically varying quantity.
Analog - A way to represent data by means of continuously variable quantities. A control or circuit, which continuously changes the level of a signal in direct relationship to the control setting. An electrical signal whose frequency and level vary continuously in
Attenuator - A device to decrease or increase the strength of a signal.