Crossword clues for impedance
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Impedance \Im*ped"ance\, n. [Impede + -ance.] (Elec.) The apparent resistance in an electric circuit to the flow of an alternating current, analogous to the actual electrical resistance to a direct current, being the ratio of electromotive force to the current. It is equal to root R^{2 + X^ 2}, where R = ohmic resistance, X = reactance. For an inductive circuit, X = 2[pi]fL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 [div] 2[pi]fC, where C = capacity.
Douglas Harper's Etymology Dictionary
1886, from impede + -ance.
Wiktionary
n. 1 (label en 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 (label en physics) A quantity analogous to electrical impedance in some other energy domain 3 # (label en physics usually with “mechanical”) a measure of opposition to motion of something subjected to a force; the ratio of force to velocity treated as complex quantities. 4 # (label en physics usually with “acoustic” or “sound”) the ratio of sound pressure to volume flow rate treated as complex quantities. 5 (label en 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
WordNet
n. a material's opposition to the flow of electric current; measured in ohms [syn: electric resistance, electrical resistance, resistance, resistivity, ohmic resistance]
Wikipedia
Impedance is the complex-valued generalization of resistance. It may refer to:
- Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium
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Electrical impedance, the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit
- Characteristic impedance of a transmission line
- Impedance (accelerator physics), a characterization of the self interaction of a charged particle beam
- Nominal impedance, approximate designed impedance
- Mechanical impedance, a measure of opposition to motion of a structure subjected to a force
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Wave impedance, a constant related to electromagnetic wave propagation in a medium
- Impedance of free space, a universal constant and the simplest case of a wave impedance
Impedance in Accelerator Physics is a quantity that characterizes the self interaction of a charged particle beam, mediated by the beam environment, such as the vacuum chamber, RF cavities, and other elements encountered along the accelerator or storage ring.
Usage examples of "impedance".
Men in cargo hauler jumpsuits unloaded the sealed packages of replacement computerware: perfectly sandwiched circuits grown in orbit, sapphire films laid down in impedance paths on wafers, then sliced into specially patterned chips that followed old templates from Earth.
Techs immediately started integrating the sensors and tuning the impedances of the stasis flanges.
The linemen had fussed with multimeters and muttered about impedances and capacitances.