What is a common application for inductors?

Inductors are widely used in signal processing, especially in radio frequency circuits, due to their ability to store energy in a magnetic field when an electric current passes through them. This characteristic makes inductors crucial for tuning and filtering applications. In radio frequency circuits, they can help to select or filter specific frequencies while blocking unwanted noise. The ability to resonate at certain frequencies is vital for the proper functioning of oscillators and amplifiers in these applications.

The other applications mentioned, such as energy storage in batteries, protection against overcurrent, and automatic motor control, typically involve different components like capacitors, fuses, and relays or contactors, which perform those functions more effectively than inductors. Inductors primarily excel in scenarios where magnetic fields and frequency manipulation are involved.