noun (Electrical engineering: Circuits, Electrical power, Computing and control) Impedance is a measure of the opposition to electrical flow, that is measured in ohms. The symbol Z is used for impedance. ⇒ If you are running two 16 ohm speaker cabinets in parallel, you must set or use an amplifier and attenuator with an impedance value of 8 ohms. ⇒ The primary winding is designed to have very low impedance, and hence has negligible effect on the main current. ⇒ Impedance is a measure of the opposition to electrical flow, that is measured in ohms.
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