In electronic circuits, the inductance coil acts on the AC current limitation, and it can form a high-pass or low-pass filter, a phase shift circuit and a resonant circuit with a resistor or capacitor.
In electronic equipment, some magnetic rings are often seen. This kind of magnetic ring and the connecting cable form an inductor (the wire in the cable winds several turns of the inductance coil on the magnetic ring), which is a commonly used anti-interference component in electronic circuits , High-frequency noise has a good shielding effect, so it is called an absorbing magnetic ring, which is usually made of ferrite material, also known as a ferrite magnetic ring (referred to as a magnetic ring). The magnetic ring has different impedance characteristics at different frequencies. At low frequencies, the impedance is very small, and the impedance of the magnetic ring increases sharply when the signal frequency increases.
A detailed inductor tutorial: working of an inductor