In the context of inductance, what does the term 'self-induction' refer to?

Self-induction refers to the phenomenon where a changing current within a coil generates an electromotive force (emf) within the same coil. This occurs due to the magnetic field produced by the current. When the current through the coil changes, it alters the magnetic field around the coil, which in turn induces an emf in accordance with Faraday's law of electromagnetic induction. This induced emf opposes the change in current, demonstrating Lenz's law, which states that the direction of induced emf will work against the change that created it. This means that as the current rises or falls, the self-induced emf works to counteract that change, making the coil resistant to abrupt changes in current.

Understanding this concept is fundamental in applications involving inductance, such as in transformers and inductors, where the relationship between changing currents and induced voltage is critical to their operation.