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:
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 ?
The KZ feature controls all port impedances when switching between RF ports, preserving the return loss.
Abstract: Trace impedances are specified and controlled on PCBs, as their nominal impedance value and variations are kev factors in establishing system I/O bus performance.
0] are the low-frequency impedances of bare metal and coating, at time t = 0, respectively; [theta] is the decay constant (the inverse slope of the exponential fit line in the graph of In(|Z|(t) - |Z[|.
The impedances of identified dominating processes are subtracted from the impedance spectrum.
5] mol, because it is difficult to distinguish the difference between the impedances of the initial condition due to [H.
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 ideal case) SDRAM DDR can be used with typical industry standard board impedances between 50 [ohm] and 100 [ohm] for trace lengths greater than 1 inch.
The important issue is that any value that is close to matching impedances will result in reduced reflections.
For the two 0805 products, one has an epoxy coating and impedances of 67, 90, 120, or 180 Ohms and the other has a magnetic shield and impedances of 67, 90, 120, 180, 260, or 360 Ohms.
In contrast, ispClock5500 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.