What does an inductor store energy in?

An inductor stores energy in a magnetic field. When current flows through the coil of an inductor, it creates a magnetic field around the coil. This magnetic field is generated due to the movement of electric charges, which causes a buildup of energy in the form of magnetic flux.

The energy stored in the inductor can be expressed mathematically, showcasing that the energy (in joules) is proportional to the square of the current flowing through the inductor and the inductance value. When the current through the inductor changes, the magnetic field also changes, leading to a phenomenon known as inductive reactance, which opposes changes in current.

Recognizing that inductors specifically rely on magnetic principles rather than electric fields, gravitational fields, or thermal energy is key to understanding their function in electrical circuits. Electric fields relate to capacitors, while gravitational fields and thermal energy do not apply to the operation of inductors.