What is the definition of winding of inductance coil?

Definition: An induction coil is wound around an insulating tube with wires insulated from each other. The insulating tube can be hollow or contain iron core or magnetic powder core, which is called inductance for short. It is expressed by L, and the units are Henry (H), MilliHenry (mH) and Micro Henry (uH),1h =103mh =106uh.

Function: The electrical characteristics of induction coil are opposite to that of capacitor, "blocking high frequency and passing low frequency". High-frequency signals will encounter great resistance when passing through the inductance coil, and it is difficult to pass; However, the resistance of low-frequency signals through it is relatively small, that is, low-frequency signals can easily pass through. The resistance of the inductance coil to direct current is almost zero.