IMPEDANCE

'Impedance' may refer to:

★ the ratio of the voltage phasor to the electric current phasor, as in

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★ Electrical impedance, a measure of opposition to time-varying electric current in an electric circuit.

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★ Characteristic impedance, a measure of opposition to electric current propagation in a transmission line.

★ Impedance matching and Impedance mismatch.

★ Vacuum impedance, a universal constant.

★ Electromagnetic impedance, a constant related to electromagnetic wave propagation in a medium.

★ Mechanical impedance, a measure of opposition to motion of a structure subjected to a force.

★ Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium.

★ Linear response function, a general way to represent the input-output characteristics of a system.