line impedance

**line impedance** refers to the measure of opposition that a transmission line presents to the flow of alternating current (AC). It is a complex quantity consisting of resistance and reactance, typically expressed in ohms (Ω). Line impedance is crucial in electrical engineering and telecommunications for analyzing signal transmission, minimizing reflections, and ensuring efficient power delivery in cables and circuits. Understanding and managing line impedance helps optimize performance in systems such as power lines, radio frequency (RF) transmission, and data communication networks.