impedance
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
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.
something that impedes; an obstacle or hindrance.
Origin of impedance
1Other words from impedance
- self-im·ped·ance, noun
Words Nearby impedance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use impedance in a sentence
There are a few factors that can affect a wire’s resistance, including length, thickness, and impedance.
We’ll walk you through terms like impedance, gauge, and resistance, followed by some products we stand behind.
A good EEG signal should have less than 50 kilo-Ohms of impedance.
Brainwaves of people with coarse, curly hair are now less hard to read | Laura Sanders | May 5, 2020 | Science News For StudentsIn applying Ohm's law to an alternating current circuit, impedance must be substituted for resistance.
Physics | Willis Eugene TowerFind the reactance of a choke coil having a resistance of 10 ohms, when its impedance is 50 ohms.
Physics | Willis Eugene Tower
In all such cases the impedance which the circuit offers is made up of two things—resistance and inductance.
The battery supply to the operator's transmitter is through an impedance coil 9.
Cyclopedia of Telephony and Telegraphy, Vol. 2 | Kempster MillerThese conditions are satisfied by using in the impedance coil many turns of large wire and an ample iron core.
Cyclopedia of Telephony and Telegraphy, Vol. 2 | Kempster Miller
British Dictionary definitions for impedance
/ (ɪmˈpiːdəns) /
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
a component that offers impedance
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: Z a
Also called: mechanical impedance the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibration: Symbol: Z m
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for impedance
[ (im-peed-ns) ]
A measure of the apparent resistance posed by an electrical circuit to an alternating current (AC).
Notes for impedance
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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