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

Other articles related to "impedance":

Circlotron - Basic Transformerless Schematic
... signal differential current flows through the loudspeaker load and a simple, relatively high impedance, resistor network that ties floating supplies to the ground ... Output impedance Z of a transformerless circlotron where each stage is a single triode with plate impedance of Rp and voltage gain of μ is defined by the ... μ = 2) will have a Z of 150 ohms—sufficient to drive high-impedance headphones ...
Line Impedance Stabilization Network
... LISN (line impedance stabilization network) is a device used in conducted and radiated radio-frequency emission and susceptibility tests, as specified in various EMC/EMI test standards (e.g ... (Equipment Under Test) to create a known impedance and to provide an RF noise measurement port ...
Seismic Inversion - Post-stack Seismic Resolution Inversion
... The inversion results in acoustic impedance (AI), which is the product of rock density and p-wave velocity ... transforms seismic data to a pseudo-acoustic impedance log at every trace ... Acoustic impedance is used to produce more accurate and detailed structural and stratigraphic interpretations than can be obtained from seismic (or seismic attribute) interpretation ...
Constant K Filter - Terminology
... Some of the impedance terms and section terms used in this article are pictured in the diagram below ... of the hypothetical infinite filter are made of series elements having impedance 2Z and shunt elements with admittance 2Y ... The image impedance of the input and output port of a section will generally not be the same ...
Constant K Filter - Derivation
... k filters is the half-section "L" network, composed of a series impedance Z, and a shunt admittance Y ... given by, Thus, k will have units of impedance, that is, ohms ... It is readily apparent that in order for k to be constant, Y must be the dual impedance of Z ...