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MIT 6.002 Circuits and Electronics, Spring 2007 22 Online
OpenStudy (anonymous):

what is mean by Close and open in a circuit when we calculate the input and output impedance?

OpenStudy (kenljw):

When finding the input impedance you have two considerations is the output loaded, closed, or unloaded, opened. The same goes for output impedance referring to the input. At least this is the way on conceive it.

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