# 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

## 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.


## 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
Translations
impedanssi
impedancija
impedancia

## impedance

[ɪmˈpiːdəns] N (Elec) →
References in periodicals archive ?
5] mol, because it is difficult to distinguish the difference between the impedances of the initial condition due to [H.
where the antennas' mutual impedances are described by relationships (1)-(4) and [rho] = [[sigma].
There are three impedances, each with a different and distinct meaning, yet, we too often use the same word for each application, without the appropriate qualifier.
The Bode plot shows the frequency directly and small impedances are identifiable in the presence of large impedances.
It is noted here that their optimum load impedances for power performance are different.
Termination impedances are also more tightly constrained to reduce ringing in the signals that could cause plateaus or bumps in the signal edge, resulting in delayed threshold crossings.
In designing match networks for this approach, a scatter plot of process impedances are first mapped.
The ispClock devices compensate for timing errors due to different trace length clock nets through a programmable skew feature, match trace impedances with output impedances by programming each output characteristic, and reduce EMI by programming output switching speed or slew rate.
From the datasheet of the considered chip (the SL3S1001 from NXP semiconductors), the integrated circuit impedances are [Z.
Larger dielectric heights can be used to meet target impedances, but at the cost of routing density.
The full set of details on the test setups to collect these impedance measurements can be obtained in , which includes the employed electrodes and dimensions, experimental setups for both impedance and network analyzers, and descriptions of techniques to reduce lead impedances, contact resistances, and stray capacitances.
The measured impedances by distance relay and the tripping characteristics resulted for each model are compared, so it can be shown that how much the selected model could influence the measured impedance by distance relay and the tripping characteristic.

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