| Definition: | at a given frequency, quotient of a dynamic field quantity (such as force, sound pressure) by a kinematic field quantity (such as vibration velocity, particle velocity), or quotient of a voltage by a current
NOTE 1 – The term impedance is generally applied to a linear system and to steady sinusoidal signals.
NOTE 2 – In the case of a transient, impedance as a function of frequency is the quotient of the respective Fourier or Laplace transforms.
NOTE 3 – An impedance is the quotient of two quantities the product of which has the dimensions of power or power per unit area.
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