Impedance - Wikipedia, the free encyclopedia: "Impedance may refer to:
Electrical impedance, the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit
Characteristic impedance of a transmission line
Nominal impedance, approximate designed impedance
Wave impedance, a constant related to electromagnetic wave propagation in a medium
Impedance of free space, a universal constant
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"
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