What is an inductor primarily used for in electrical circuits?

An inductor is primarily used in electrical circuits to store energy in a magnetic field. When current flows through an inductor, it creates a magnetic field around it. This property allows the inductor to store energy temporarily, which can be released back into the circuit when the current changes. This energy storage capability is essential for various applications, such as in filters, oscillators, and power supply systems, where maintaining or controlling current flow is crucial.

Storing energy in a magnetic field also allows inductors to oppose changes in current, which plays a significant role in smoothing out fluctuations in current flow. This behavior is key in applications such as inductive load management, inductive coupling for transformers, and in making tuned circuits for radios.

The other options, while related to different electrical components or concepts, do not accurately describe the primary function of an inductor. For instance, decreasing resistance pertains more to resistors, converting voltage levels relates to transformers or voltage regulators, and regulating current flow can involve various components but not primarily inductors.