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.

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 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
Translations
impedanssi
impedancija
impedancia

impedance

[ɪmˈpiːdəns] N (Elec) → impedancia f
References in periodicals archive ?
Underestimation of percentage fat mass measured by bioelectrical impedance analysis compared to dual energy X-ray absorptiometry method in obese children.
Bioelectrical impedance analyzer derived phase angle is a cheap, noninvasive, easy, and reproducible method with minimal intra- and inter-observer variability [5] to assess malignancy by measuring altered tissue electrical properties.
Body fat percentage was determined using bioelectrical impedance analysis and the participants were classified as: Group A (15-21.
Existing methods to measure body composition, are complex and time-consuming, therefore Dr Ellen Copson, a Senior Lecturer at the University of Southampton and an oncology consultant at the University Hospital Southampton, has been awarded a grant worth around Au20,000 by research charity Breast Cancer Campaign, to test a new, simpler method of measuring body composition, called segmental bioelectrical impedance spectroscopy (sBIS).
The body composition of the study subjects was measured using bioelectrical impedance, which involves running an electrical current through the body.
Validation of bioelectrical impedance equations for predicting body composition in women
Although there was a general tendency for the bioelectrical impedance analysis (BIA) to underestimate FFMI compared to DEXA, 98% of the estimates were within plus or minus 2 kg/m2.
The input as well as output values of the body composition parameters were measured by the TANITA 418 MA tetrapolar bioimpedance scale that uses the method of bioelectrical impedance (BIA).
Usefulness of bioelectrical impedance analysis in monitoring nutrition status and survival of peritoneal dialysis patients.
Bioelectrical impedance analysis (BIA) is widely used in evaluating body-composition in epidemiological studies and clinical settings (1-4), usually by applying measures of resistance or impedance to population-specific, predictive equations for estimating total body-water (TBW), fat-free mass (FFM), and fat mass.
Bioelectrical impedance analysis (BIA) is a new technology in fisheries research that is capable of estimating proximate composition, condition, and energy content in fish quickly, cheaply, and (after calibration) without the need to sacrifice fish.
Is bioelectrical impedance accurate for use in large epidemiological studies?