A Abbreviation for "ampere" a unit of electrical current. absorption Loss or dissipation of energy as it travels through a medium, Example: radio waves lose some of their energy as they travel through the atmosphere. AC Abbreviation for "Alternating Current" acceptor atoms Trivalent atoms that accept free electrons from pentavalent atoms. AC coupling Circuit that passes an AC signal while blocking a DC voltage. AC/DC Equipment that will operate on either an AC or DC power source. AC generator Device used to transform mechanical energy into AC electrical power. AC load line A graph representing all possible combinations of AC output voltage and current for an amplifier. AC power supply Power supply that delivers an AC voltage. active component A component that changes the amplitude of a signal between input and output. active filter A filter that uses an amplifier in addition to reactive components to pass or reject selected frequencies. active region The region of BJT operation between saturation and cutoff used for linear amplification. AC voltage A voltage in which the polarity alternates. ADC Abbreviation for "analog to digital converter" Admittance (symbol "Y") Measure of how easily AC will flow through a circuit. Admittance is the reciprocal of impedance and is measured in siemens. AF Abbreviation for "audio frequency". AFC Abbreviation for "automatic frequency control". AGC Abbreviation for "automatic gain control" alkaline cell A primary cell that delivers more current than a carbon-zinc cell. Also known as an "alkaline manganese cell". alligator clip Spring clip on the end of a test lead used to make a temporary connection. alpha Ratio of collector current to emitter current in a bipolar junction transistor (BJT). Greek letter alpha "" is the symbol used. alternating current An electric current that rises to a maximum in one direction, falls back to zero and then rises to a maximum in the opposite direction and then repeats. alternator Name for an AC generator. AM Abbreviation for "amplitude modulation" ammeter A meter used to measure current. ampere Unit of electrical current. amplifier A circuit that increases the voltage, current, or power of a signal. amplitude: Magnitude or size of a signal voltage or current. analog Information represented as continously varying voltage or current rather than in discrete levels as opposed to digital data varying between two discrete levels. anode The positive electrode or terminal of a device. The "P" material of a diode. antenna, transmitting A device that converts an electrical wave into an electromagnetic wave that radiates away from the antenna. antenna, receiving A device that converts a radiated electromagnetic wave into an electrical wave. apparent power Power attained in an AC circuit as a product of effective voltage and current which reach their peak at different times.
Posted on: Sun, 14 Jul 2013 17:48:44 +0000
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