The output impedance, source impedance, or internal impedance of an electronic device is the opposition exhibited by its output terminals to the flow of an alternating current (AC) of a particular frequency as a result of
resistance,
inductance and
capacitance. The
impedance at DC (frequency of 0) is the same as the resistance component of the impedance and is termed output resistance.It is important to realize that no real device (
battery,
generator,
amplifier) is a perfect source; all have an internal impedance, though this may have little practical effect, depending on the circuit and the load.
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