im·ped·ance /ɪmˈpidṇ(t)s/
  阻抗
  im·ped·ance /ɪmˈpɪdṇ(t)s/ 名詞
  阻抗,氣道阻力
  impedance
  阻抗
  impedance
  阻抗
  Im·ped·ance n.   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 √(R² + X²), where R = ohmic resistance, X = reactance. For an inductive circuit, X = 2πfL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 ÷ 2πfC, where C = capacity.
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  impedance
       n : a material's opposition to the flow of electric current;
           measured in ohms [syn: electric resistance, electrical
           resistance, resistance, resistivity, ohmic
           resistance]