Introduction to Coil
Coils usually refer to circular wire windings, the most common coil applications are: Motors, inductors, transformers and circular antennas.
The coil in the circuit refers to the inductor. is a guide line one by one, the wires are insulated from each other, and the insulating pipe can be hollow, can also contain iron core or magnetic powder core, referred to as inductance. Inductance can be divided into fixed inductance and variable inductance, fixed inductance coil referred to as inductance or coil. In L, the Unit has Henry (H), Henry (MH), Micro Henry (UH), 1h=10^3mh=10^6uh.