Impedance

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