Introduction to Inductors and Their Working Principle

An Inductor is an essential electronic component that converts electric energy into magnetic energy and stores it based on the principle of electromagnetic induction. Any device capable of producing self-inductance and mutual inductance can be categorized as an inductor. Inductors are widely used in AC circuits where they serve as resistance, voltage regulators, AC couplers, and loads. They are also used in combination with capacitors for tuning, filtering, frequency selection, and division.

The most basic form of an inductor consists of a conductor coiled into a simple loop. More advanced inductors use a magnetic core, with the wire wound multiple times around it to enhance inductance. Regardless of the structure, the inductor's core and the number of coil turns impact the inductance level. As the number of turns increases, so does the inductance. Additionally, when a core is introduced, the inductance increases further.

In a circuit, inductors exhibit inductive reactance, which resists the flow of alternating current (AC). This is related to both the frequency of the current and the inductance value of the inductor. In simple terms, while inductance allows direct current (DC) to pass freely, it obstructs AC flow, which is quantified as inductive reactance, expressed as XL = 2πfL.