Basic Radio is a free introductory textbook on electronics based on tubes. See the editorial for more information....


Author: Hans Lohninger

Electrical impedance, or simply impedance, describes a measure of opposition to a sinusoidal alternating current (AC). Electrical impedance extends the concept of resistance to AC circuits, describing not only the relative magnitudes of the voltage and current, but also the relative phases. In general impedance is a complex quantity.

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Last Update: 2011-03-27