Also called voltage amplification. Ratio of amplifier output voltage to input voltage usually expressed in decibels.

Large load impedance will draw a small load current and so loading of the source is small. (light load). A small load impedance will draw a large load current from the source. (heavy load).

Illustration of an electrical or electronic circuit with the components represented by their symbols.

Feedback configuration where a portion of the output voltage is fed back to the input of an amplifier.

Abbreviation for ampere, the unit of electrical current.

Trivalent atoms that accept free electrons from pentavalent atoms.

Circuit that passes an AC signal while blocking a DC voltage.

A graph representing all possible combinations of AC output voltage and current for an amplifier.

A component that changes the amplitude of a signal between input and output.

A filter that uses an amplifier in addition to reactive components to pass or reject selected frequencies.