What does self-induction refer to?

Self-induction refers to a phenomenon that occurs in a coil when it generates voltage within itself as a result of changes in the current flowing through it. When the current flowing through the coil varies, it creates a changing magnetic field that ultimately induces an electromotive force (EMF) or voltage across the same coil. This induced voltage opposes the change in current, which is in accordance with Faraday's Law of Electromagnetic Induction and Lenz's Law.

This process is vital in many applications, like transformers and inductors in electrical circuits, as it helps manage and control current flow. Understanding self-induction is crucial for electrical apprentices, as it lays the foundation for grasping larger concepts in electromagnetism and electrical circuit design.