From 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
- 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
- Impedance, a characterization of the self interaction of a charged particle beam
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