Define inductance in electrical terms.

Inductance is fundamentally defined as the property of a conductor or coil that allows it to resist changes in current flow through the influence of electromagnetic fields. This phenomenon occurs when a changing current in a wire generates a magnetic field around it, which can induce a voltage in the wire itself or in nearby conductors. The ability to resist changes in current is critical in various applications, particularly in inductors and transformers within electronic and HVACR systems, because it helps maintain a stable flow of electricity despite fluctuations in demand or supply.

When the current through an inductor changes, the magnetic field also changes, creating an induced electromotive force (emf) that opposes the change according to Lenz's law. This aspect is key in the operation of many electrical devices and systems, such as in filtering applications and energy storage, making the understanding of inductance essential for HVACR professionals.