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# Impedance

[im-peed-ns] /ɪmˈpid ns/

noun
1.
Electricity. 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 usually expressed in ohms. Symbol: Z.
2.
Also called mechanical impedance. Physics. the ratio of the force on a system undergoing simple harmonic motion to the velocity of the particles in the system.
3.
something that ; an obstacle or hindrance.
/ɪmˈpiːdəns/
noun
1.
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 Z
2.
a component that offers impedance
3.
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 Za
4.
Also called mechanical impedance. the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibration Zm
n.

1886, from impede + -ance.
impedance
(ĭm-pēd’ns)
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.
impedance [(im-peed-ns)]

A measure of the apparent resistance posed by an electrical circuit to an alternating current (AC).

Note: The term impedance is most often encountered in dealing with antennas and speakers in television, stereo, and radio systems.

electronics, physics
Opposition to flow of alternating current. Impedance consists of resistance plus reactance (capacitive or inductive). Measured in Ohms.
(2003-12-02)

Tagged:

• Impedance-matching

noun, Electricity. 1. the technique of choosing or adjusting electric circuits and components so that the impedance of the load is equal to the internal impedance of the power source, thereby optimizing the power transfer from source to load. impedance matching A technique of electric circuit design in which one component provides power to another, […]

• Impede

[im-peed] /ɪmˈpid/ verb (used with object), impeded, impeding. 1. to retard in movement or progress by means of obstacles or hindrances; obstruct; hinder. /ɪmˈpiːd/ verb 1. (transitive) to restrict or retard in action, progress, etc; hinder; obstruct v. c.1600, back-formation from impediment, or else from Latin impedire “impede, be in the way, hinder, detain,” literally […]

• Impeded

[im-peed] /ɪmˈpid/ verb (used with object), impeded, impeding. 1. to retard in movement or progress by means of obstacles or hindrances; obstruct; hinder. /ɪmˈpiːd/ verb 1. (transitive) to restrict or retard in action, progress, etc; hinder; obstruct v. c.1600, back-formation from impediment, or else from Latin impedire “impede, be in the way, hinder, detain,” literally […]

• Impedes

[im-peed] /ɪmˈpid/ verb (used with object), impeded, impeding. 1. to retard in movement or progress by means of obstacles or hindrances; obstruct; hinder. /ɪmˈpiːd/ verb 1. (transitive) to restrict or retard in action, progress, etc; hinder; obstruct v. c.1600, back-formation from impediment, or else from Latin impedire “impede, be in the way, hinder, detain,” literally […]

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