# impedance

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Related to Impedances: effective resistance

## im·ped·ance

(ĭm-pēd′ns)
n.
1. Symbol Z A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance.
2. An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.

## impedance

(ɪmˈpiːdəns)
n
1. (Electronics) a measure of the opposition to the flow of an alternating current equal to the square root of the sum of the squares of the resistance and the reactance, expressed in ohms. Symbol: Z
2. (Electronics) a component that offers impedance
3. (General Physics) Also called: acoustic impedance the ratio of the sound pressure in a medium to the rate of alternating flow of the medium through a specified surface due to the sound wave. Symbol: Za
4. (General Physics) Also called: mechanical impedance the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibration. Symbol: Zm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## im•ped•ance

(ɪmˈpid ns)

n.
1. the total opposition to alternating current by an electric circuit, equal to the square root of the sum of the squares of the resistance and reactance of the circuit and usu. expressed in ohms.
2. the ratio of the force on a system undergoing harmonic motion to the velocity of the particles in the system.
[1886]

## im·ped·ance

(ĭm-pēd′ns)
A measure of the opposition to the flow of an electric current through a circuit of alternating current. Impedance is measured in ohms.
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 impedance - a material's opposition to the flow of electric current; measured in ohmselectrical phenomenon - a physical phenomenon involving electricityohmage - the ohmic resistance of a conductor
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
impedanssi
impedancija
impedancia

## impedance

[ɪmˈpiːdəns] N (Elec) →
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
References in periodicals archive ?
A proven approach is to constrain upfront, design to target impedances, and optimize the PCB.
Pre-stack inversion is usually used to discriminate fluid when the shear impedances (Zs), acoustic impedance (Zp), and the ?
[Z.sub.n1] are inverter side inductor impedances; [Z.sub.12], [Z.sub.22], ....
In modal filter silencers, thin MPPs with predominantly resistive impedances are used and the MPPs are placed on the duct cross section to locations of high particle velocity.
Figure 1(a) illustrates a configuration of a step impedance resonator (SIR) consisting of three consecutive lines with two different characteristic impedances ([Z.sub.p] and [Z.sub.s]).
To verify the derived formulas of the effective surface impedances, we modeled the two parallel electric metasurface illustrated in the inset of Fig.
[Z.sub.p1] and [Z.sub.p2] are the input impedances of the two probes, respectively.
In this study, only four external nodes with six degrees of freedom (DOF) per node are needed for further study, so the total DOF needed for housing impedances is n = 24.
The simulated impedances from 40 Hz to 110 MHz using these values are given in Figure 6(a) with the errors of each compared to the grasping impedance data given in Figure 6(b).
In order to obtain maximum power transfer from a device to a load, their impedance must be conjugately matched.

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