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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
impedanssi
impedancija
impedancia

impedance

[ɪmˈpiːdəns] N (Elec) → impedancia f
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
References in periodicals archive ?
The most common method of body composition analysis is bioelectrical impedance, which is relatively inexpensive, highly portable, non-invasive and easy to use.
A multi-frequency bioelectrical impedance analyzer, InBody S5 Biospace device (Inbody Co, Ltd, Seoul, Korea/Model 720), was used according to the manufacturer's guidelines.
Measurement methods: After a 12-hour fasting period, all participants were evaluated by a bioelectrical impedance analysis (BIA) device (GAIA 359 PLUS; Jawon Medical, Korea; 2011) with regard to height, body weight, the sum of appendicular lean masses (ALMs) of the four limbs, impedance, and fat percentage.
It is based on the principle of bioelectrical impedance (the vector sum of resistance and reactance).
It also includes an accelerometer for tracking physical activity, an ECG heart activity tracker and bioelectrical impedance monitoring.
[15] Body composition parameter analysis was performed on the participants using Bodystat apparatus (Bodystat1500 MDD model).It involves the technique of bioelectrical impedance analysis configured with two lead wires which are removable.
In this regard, the bioelectrical impedance vector analysis (BIVA) emerges as a technique to assess hydration status with no inherent errors of bioimpedance equations or requirements for biological assumptions such as the constant tissue hydration (Lukaski and Piccoli, 2012; Norman et al., 2012).
Validation of a bioelectrical impedance analysis equation to predict appendicular skeletal muscle mass (ASMM).
Dannenberg notes that there are other measurements of body composition, such as bioelectrical impedance analysis, and this may provide information about body composition similar to that obtained with a DXA scan.
Demographic characteristics (age, gender, socioeconomic status, and educational level), self-reported medical history, anthropometrics, respiratory questionnaire (11), cardiovascular risk, spirometry, CPET, body composition (bioelectrical impedance), and level of physical activity in daily life (PADL) were collected from participants.
The scale is able to measure all this information through Bioelectrical Impedance Analysis (BIA), which was also used in the Lenovo HS10 ( review ) and the TomTom Touch ( review ).