Glossary

Adder: In a computer it is a device which can form the sum of two or more numbers.
Address: Information which identifies a particular location in the memory of a computer.
Aerial: The part of a communication system from which energy is radiated or received.
ALGOL: A symbolic language used to program computers in mathematical and engineering applications.
Alignment: The adjustment of tuned circuits so that they respond in a desired way at a given frequency.
AM (amplitude modulation): A method of sending a message on a radio or light wave by varying the amplitude of the wave in response to the frequency of the message.
Amplifier: A device whose output is a magnified function of its input.
Analogue signals: Signals that respond to or produce a continuous range of values rather than specific values.
Analogue-to-digital converter: A circuit designed to convert an analogue voltage into a binary code which can be read by a computer.
AND gate: A building block in digital logic circuits.
Astable: A circuit which can generate a continuous waveform with no trigger.
Atom: The smallest particle of a chemical element that can exist alone or in combination with other atoms.
Attenuator: A network designed to reduce the amplitude of a wave without distortion.
Audio frequency: Any frequency at which the sound wave can normally be heard. The audio frequencies for most humans are those frequencies between 15 Hz and about 20 kHz.
Automation: Any device or system that takes the place of humans...

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