(n.) 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 = 2/fL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 / 2/fC, where C = capacity.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). impedance. Retrieved September 23, 2026, from http://smartdefine.org/impedance/definitions/2019457 |
| Chicago | Webster's. 2011. "impedance" http://smartdefine.org/impedance/definitions/2019457 (accessed September 23, 2026). |
| Harvard | Webster's 2011, impedance, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/impedance/definitions/2019457>. |
| MLA | Webster's. "impedance" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/impedance/definitions/2019457> |