What is the impedance angle of an inductor?

• A. -90°
• B. 0°
• C. +90°
• D. 180°

Answer: (C)

The impedance angle of an inductor is +90°. This positive angle indicates that the current lags the voltage by 90 degrees in an inductive circuit.

In the context of an AC circuit, inductors resist changes in current, which results in a phase shift between the voltage across the inductor and the current flowing through it. This is a fundamental characteristic of inductive components, leading to the positive angle representation in the impedance.

In phasor representation, impedance (Z) for an inductor can be expressed as ( Z = jX_L ), where (X_L) is the inductive reactance and (j) represents the imaginary unit. The impedance is entirely imaginary for an inductor, resulting in an angle of +90°, corresponding to the positive imaginary axis in the complex impedance plane.

This phase relationship is critical in understanding AC circuits, particularly when analyzing the behavior of inductors in response to alternating current signals.