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What does impedance mean?

Looking for the meaning or definition of the word impedance? Here's what it means.

Noun
  1. (physics) A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, and inductive and capacitive reactances; the ratio of voltage to current treated as complex quantities.
  2. (physics) A quantity analogous to electrical impedance in some other energy domain
    1. (physics) a measure of opposition to motion of something subjected to a force; the ratio of force to velocity treated as complex quantities.
    2. (physics) the ratio of sound pressure to volume flow rate treated as complex quantities.
  3. (by analogy, software engineering, usually with “mismatch”) a measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases
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Examples
Body composition, including fat free mass, fat mass, was assessed by bioelectric impedance.
This feature sends a signal with a sharp edge down the transmission line and looks for reflections due to impedance imperfections.
Placing the preamplifiers as close to the detectors as possible minimizes the output impedance for driving further stages.
It has high dynamic power and a low impedance driver so it sounds full, without any muddiness.
The voltage ratios are equal to the turns ratios so we can just square the voltage ratios to get the impedance ratios.
After the leads for impedance cardiography were applied, we were unable to accurately collect and record bioimpedance data from 4 patients.

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