impedance


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Related to impedance: impedance matching, inductance, acoustic impedance

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:
Noun1.impedance - a material's opposition to the flow of electric currentimpedance - a material's opposition to the flow of electric current; measured in ohms
electrical phenomenon - a physical phenomenon involving electricity
ohmage - the ohmic resistance of a conductor
Translations
impedanssi
impedancija
impedancia

impedance

[ɪmˈpiːdəns] N (Elec) → impedancia f
References in periodicals archive ?
This freeware version allows users to trend voltages, impedance, strap resistances, cell temperature and specific gravity.
Standard switches without KZ create a large voltage standing wave ratio (VSWR) transient when switching RF paths because the impedance of the switch is not well controlled during the switching event.
The main goal of PDN design is to minimize the impedance between power and ground, across a range of frequencies.
Keywords Electrochemical impedance spectroscopy (EIS), Service life prediction, Equivalent circuit model, Low-frequency impedance, Salt spray test
Still, experts agreed that the results do not suggest that impedance monitoring can replace daily weight monitoring of heart failure patients as a means for predicting events and guiding therapy.
Other researchers have used impedance spectroscopy to assess polymer behavior including molecular rotation and reorientation (6), segmental motion of thin films (7), and the glass transition temperature and relaxation processes (8).
In this paper is developed a method which allows bilateral robots teleoperation in constrained environments using a model-based impedance control strategy.
Wayne Kerr 6500 Series Precision Impedance Analyzers feature an intuitive touch-screen user interface with easy to use drop down menus and a Windows(r) compatible data format for subsequent analysis.
The efficiency of this method relies on of the possibility to get information in three dimensions: the real and imaginary parts of the impedance and the frequency.
One approach to achieving a target impedance might be to start with a set of nominal values using the above sorts of curves, fix the dielectric thickness, find the combination of glass and resin to meet this thickness, and then, based on the dielectric constant, tweak the line width to bring the trace to 50 [OMEGA].
In its place we use impedance, Z, which is a measure of a circuit's tendency to resist (or impede) the flow of an alternating electrical current.