# impedance

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## 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.
[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
Translations
impedanssi
impedancija
impedancia

## impedance

[ɪmˈpiːdəns] N (Elec) →
References in periodicals archive ?
Acoustic impedance is the product of these two numbers, expressed in MegaRayls.
Recently concepts from fractional calculus, the branch of mathematics concerning noninteger differentiation and integration, have been imported into this field [8-11] to model the impedance of biological tissues.
Afterward, the exact numbers of live or lysed cells were observed by the effect of thawing rate on the cells through impedance spectroscopy, as we know that there is a relationship between impedance, frequency, and temperature.
Agilent's new impedance analyzers are the only instruments on the market with the measurement accuracy to evaluate components from mohm to Mohm over the 20 Hz to 3 GHz frequency range, and to uncover the real characteristics of high-quality components.
The main goal of PDN design is to minimize the impedance between power and ground, across a range of frequencies.
The measured impedance at the point that relay is connected is the basis in distance protection.
In this paper, we propose a novel approach to match a real impedance load at three uncorrelated frequencies by using a stubbed coupling line impedance transformer.
In order to obtain the extended impedance line which is used to transform complex termination impedance to 50 Ohm, Smith chart, especially reflection coefficient chart, is used.
In [4], a stacked annular ring coupled to a shorted circular patch was presented which offered a large impedance bandwidth and low cross-polarization levels.
This paper describes application of full and half section of asymptotic conical dipole as feed for reflector IRA for 100 [ohm] and 200 [ohm] input impedance respectively.
set] is the setting impedance of zone 1 of distance protection, Z(t) is the real setting impedance of zone 1 of distance protection in different time period.

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