What is self-inductance?

Self-inductance refers to the property of a conductor, typically a coil or inductor, to oppose changes in the electric current flowing through it. When the current through the conductor changes, it creates a changing magnetic field. According to Faraday's law of electromagnetic induction, this changing magnetic field induces a voltage in the conductor itself that acts in opposition to the change in current. This phenomenon is essential in various applications, such as in inductors and transformers, where controlling current and voltage levels is crucial.

The concept plays a significant role in circuits where inductors are used; they can store energy in their magnetic field and release it back into the circuit when needed, helping to stabilize current flow. Understanding self-inductance is fundamental to grasping how inductors function in AC circuits and their impact on overall circuit behavior.