The main function of the inductor is to isolate and filter the AC signal or form a resonant circuit with capacitors and resistors.
1. The reason why the inductance works is that it generates a changing magnetic field when it passes an unsteady current, and this magnetic field will in turn affect the current. Therefore, in this way, any conductor, as long as it passes an unsteady current, will A changing magnetic field will in turn affect the current, so any conductor will have a self-inductance phenomenon;
2. The characteristics of inductance are the opposite of those of capacitors. It has the characteristics of preventing the passage of alternating current and allowing direct current to pass smoothly. The characteristics of the inductor are to pass DC and block AC. The higher the frequency, the greater the coil impedance. Inductors often work with capacitors in circuits to form LC filters, LC oscillators, etc. In addition, people also use the characteristics of inductance to manufacture choke coils, transformers, relays, etc.