What does an inductor do in a circuit?

An inductor in a circuit primarily introduces inductance, which is a property that opposes changes in current. When current flows through an inductor, it generates a magnetic field around itself. This magnetic field stores energy temporarily, which is characterized as inductance.

While inductors do serve the function of storing electrical energy in their magnetic field, the essence of their role in the circuit design is rooted in the property of inductance itself. This property is crucial for applications in filtering, timing circuits, and in various signal processing scenarios where it is necessary to manage how currents change over time. Inductors react to changes in current by creating back EMF (electromotive force), which helps in controlling circuits by smoothing transitions and shaping signals.

The other answers touch on those characteristics as well but may not fully convey the primary operational principle of inductors in a circuit. Hence, understanding that an inductor introduces inductance gives clarity on its fundamental role and importance within electrical and electronic systems.