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In the electric eel, some 5,000 to 6,000 stacked electroplaques are capable of producing a shock at up to 600 volts and 1 ampere of current (600 watts) for a duration of two milliseconds.
In this example the amplifier has a voltage gain of 3; that is at any instant v o = 3 v i {\displaystyle v_{o}=3v_{i}\,}. An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). An amplifier functions by using electric power from a power supply to increase the amplitude of the voltage or current signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.