What do the reactive components in impedance primarily represent in AC circuits?

• A. Reactance arising from inductors and capacitors.
• B. Pure resistance only.
• C. Short circuit faults.
• D. Ground fault.

Answer: (A)

In AC circuits, impedance has two parts: resistance (the real part) and reactance (the imaginary part). The reactive components are the energy-storage elements—inductors and capacitors—and they contribute reactance to the impedance. This reactance, not dissipation, is what opposes changes in current and causes a phase shift between voltage and current. Inductive reactance increases with frequency, while capacitive reactance decreases with frequency, and together they form the imaginary part of the impedance (often represented as jX). Short circuit faults and ground faults are faults, not the reactive effects of L and C. Therefore, the reactive components in impedance primarily represent the reactance arising from inductors and capacitors.