# Amplifiers

An amplifier, also known as an electronic amplifier or amp, is a type of electronic instrument that can boost the power of a signal. It is a two-port electronic circuit that uses power from a power supply to increase the amplitude of a signal applied to its input terminals, resulting in a signal of proportionally greater amplitude at its output. The amount of amplification given by an amplifier is determined by its gain, which is the ratio of output voltage, current, or power to the input voltage, current, or power. A circuit with a power gain greater than one is referred to as an amplifier.

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