How is inductive reactance defined?

Inductive reactance is defined as the opposition to alternating current (AC) caused by inductance in a circuit. This phenomenon occurs because an inductor resists changes in current flow, which is particularly relevant in AC circuits where the current direction and magnitude continuously vary.

When AC flows through an inductor, it creates a magnetic field which builds up and collapses as the current changes. This results in a phase difference where the voltage across the inductor leads the current, and this phase relationship is a key characteristic of inductive reactance. The value of inductive reactance increases with the frequency of the AC signal, meaning that at higher frequencies, the inductor opposes the current flow more strongly.

The other definitions provided do not pertain directly to inductive reactance. For instance, resistance to direct current (DC) and the resistance of a conductor describe different concepts related to how materials resist the flow of electric current, but they do not involve inductance or alternating current behavior. Impedance is a broader concept that includes resistance and reactance but does not specifically address the unique behavior of inductance with AC. Thus, defining inductive reactance as opposition to AC current due to inductance captures its essence accurately.