**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

... 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

... LISN (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

... 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

... 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

... 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 ...Related Subjects

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