Electrical Definitions

AC : The current whose magnitude and direction remain changing at a definite rate is called alternating current or AC.

Amplitude : The maximum value of an alternating quantity in positive or negative direction w.r.t. its mean value is called amplitude.

Alternator : An alternator is a machine which converts mechanical energy into AC electrical energy.It is also known as an 'AC generator'.

Active Electronics Components : The components which are capable of amplifying or processing an electrical signal are known as active components e.g. diodes,triodes,transistors etc.

Accumulator : It is a registor in a micro-processor in which the result of a given operation is stored temporarily.

Audible waves : Waves which can be heard by human ears are called audible waves. Their frequency range exttends from 20 Hz to 20 KHz but it may vary from person in accordance to his age.

Amplifier : A triode or transistor based circuit which is capable to increase the amplitude(or voltage) or power of an input signal is called an amplifier.

Amplitude Modulation : The process of varying the amplitude of the sinusoidal carrier wave by the amplitude of the modulating signal.

Asynchronous Communication : A way of transmitting data serially from one device to other,in which each transmitted character is processed by a start bit and followed by a stop bit.This is also called start/stop transmission.

Attenuation : The losses that occur and reduce progressively the amplitude and power in a line. These loses are of two types.(1) loses due to heat dissipation(2) dielectric loses

AF choke: A choke designed to work in the frequency range of 20 to 20,000 Hz is called an AF or audio frequency choke.It is used for suppressing the flow of a.f. currents in various filter and amplifier circuits.