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 rootR^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.
   [Webster 1913 Suppl.]

	

	impedance
    n 1: a material's opposition to the flow of electric current;
         measured in ohms [syn: electric resistance, electrical
         resistance, impedance, resistance, resistivity,
         ohmic resistance]

	

	18 Moby Thesaurus words for "impedance":
   capacitive reactance, clog, cumbrance, electric resistance,
   hindrance, impediment, inductive reactance, magnetic reluctance,
   ohm, ohmage, reactance, reluctance, reluctivity, resistance,
   skin effect, specific reluctance, surface resistance,
   volume resistance

	

	impedance

    Opposition to flow of alternating
   current.  Impedance consists of resistance plus reactance
   (capacitive or inductive).  Measured in Ohms.

   (2003-12-02)