Impedance 02 : (1) The total opposing force to the flow of current in an ac circuit. (2) The combination of resistance and reactance affecting the flow of an alternating current generally expressed in ohms
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}