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== What is an Amplifier? ==
An amplifier (aka amp) is an electronic device that can increase the power of a signal. An amplifier uses electric power from a power supply to increase the amplitude of a signal. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one.
[[File:Amplifiers7.png|framethumb|center|1000px|Amplifier basic diagram - (a) A voltage amplifier fed with a signal V(t)
(b) Transfer characteristics of linear voltage amplifier. Inspired from Sedra and Smith]]
[[File:Amplifiers8.png|frame|center]]