im·ped·ance ( m-p d 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. (Physics / 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. (Physics / 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
| impedance (m-pdns) A measure of the opposition to the flow of alternating current through a circuit. Impedance is measured in ohms. The resistance of a circuit to direct current (also measured in ohms) is generally not the same as its impedance, due to the effects of capacitance and induction in and among the components of the circuit. See also impedance matching. |
ThesaurusLegend: Synonyms Related Words Antonyms
| 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 |
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