Impedance is the complex-valued generalization of resistance. It may refer to:

  • Acoustic impedance: a constant related to the propagation of sound waves in an acoustic medium.
  • 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.
    • High impedance, when only a small amount of current is allowed through.
    • The characteristic impedanceĀ of a transmission line.
    • Impedance (accelerator physics), a characterization of the self-interaction of a charged particle beam.
    • Nominal impedance, approximately designed impedance.
    • Impedance matching, the adjustment of input impedance, and output impedance.
  • Mechanical impedance: a measure of opposition to the motion of a structure subjected to a force.
  • Wave impedance: a constant related to electromagnetic wave propagation in a medium.

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