Inductive Reactance
The opposition offered by an inductor to alternating current flow, directly proportional to AC frequency and inductance.
Governing formula
X_L = 2π f L = ω L
SI unit
Ω (Ohms)
In depth
Inductors allow steady DC current to pass with zero inductive reactance (X_L = 0), but strongly oppose high-frequency AC currents as frequency increases.
Examples in the real world
Inductive choke coils in radio receivers filtering out high-frequency radio frequency (RF) noise while allowing low-frequency signals to pass.