The inductance coil is composed of a circle by a wire around the wire insulation pipe insulation, each other, and the insulating tube can be hollow, can also contain iron core or cores, referred to as the inductor.
Classification, inductance
According to the classification of the inductance forms: fixed inductance and variable inductance.
According to the classification of magnetic properties: air core coil and ferrite coil, iron core coil, copper coil.
According to the classification of the nature of the work: the antenna coil, coil, choke coil, coil, deflecting coil notch.
According to the classification of single coil winding structure, multilayer coil, honeycomb coil.