# impedance

(redirected from*Impedances*)

Also found in: Thesaurus, Medical, Encyclopedia.

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.

[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 WordsSynonyms

**Legend:**Switch to new thesaurus

Noun | 1. | impedance - a material's opposition to the flow of electric current; measured in ohmselectrical phenomenon - a physical phenomenon involving electricity ohmage - the ohmic resistance of a conductor |

Translations

**impedanssi**

**impedancija**

**impedancia**

Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

Link to this page: