The SI unit of impedance is the ohm, symbolized by Ω. Impedance measures the opposition that a circuit presents to the flow of alternating current, combining both resistance and reactance.
The SI unit of impedance is the **ohm** (symbol: **Ω**). Impedance represents the opposition that a circuit presents to the flow of alternating current (AC), and it is a combination of resistance, inductive reactance, and capacitive reactance.
