Inductor is a commonly used component in switching power supply, because its current, voltage phase is different, so theoretically the loss is zero.
Inductor is a passive component, and only works when current passes through it. Its function is to convert ac to dc, and then filter out part of the noise wave, so that the smooth wave can pass through.
Components of inductance: generally, it is composed of magnetic core or iron core, skeleton, winding group, shielding cover, packaging material, etc.
Common mode inductors (Choke), also known as Common mode Choke, are used to filter Common mode EMI signals in switching power supplies of computers.
Color ring inductors, similar to common color ring resistors, usually use three or four color rings to mark the inductance quantity.
Magnetic beads are specially designed to suppress high-frequency noise and spike interference on signal lines and power lines, and also have the ability to absorb electrostatic pulses. Magnetic beads are used to absorb UHF signals.