Hypertext Webster Gateway: "impedance"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
impedance
n : a material's opposition to the flow of electric current;
measured in ohms [syn: {electric resistance}, {electrical
resistance}, {resistance}, {resistivity}, {ohmic
resistance}]
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