What is a Amplifier?
Generally, an Amplifier or simply Amp, is any device that changes, usually increases, the amplitude of a signal. The "signal" is usually voltage or current. (So, an amplifier will generally increase the signal level)
In popular use, the term today usually refers to an electronic amplifier, often as in audio applications. The relationship of the input to the output of an amplifier — usually expressed as a function of the input frequency — is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.
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