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Input ImpedanceThe input impedance or load impedance of a circuit or electronic device is the impedance actually experienced by a signal which is connected to it. For example, an amplifier with 100,000 ohm input impedance looks equivalent to a 100,000 ohm resistor to the signal coming into it. Generally in audio and hi-fi, the input impedance of components is several times higher than the output impedance connected to them. This is called voltage bridging or impedance bridging. In this case, - Zload >> Zsource
In video and other systems the impedance of inputs and outputs are the same. This is known as impedance matching or a matched connection. In this case, - Zload = Zsource
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