impedance

1. n. a material's opposition to the flow of electric current; measured in ohms Source: wordnet

2. 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 = 2pfL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 ÷ 2pfC, where C = capacity. Source: webster

3. The apparent resistance in an electric circuit to the flow ofan alternating current, analogous to the actual electrical resistanceto a direct current, being the ratio of electromotive force to thecurrent. It is equal to R2 + X2, where R = ohmic resistance, X =reactance. For an inductive circuit, X = 2pfL, where f = frequencyand L = self-inductance; for a circuit with capacity X = 1 ÷ 2pfC,where C = capacity. Source: adambom

4. n:100 n a material's opposition to the flow of electric current; measured in ohms Source: ecdict

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