Inductor coil action

　The self-induced electromotive force in the coil of the inductor is always resistant to changes in the current in the coil. The inductance coil has an obstructive effect on the alternating current, and the magnitude of the resistance is called xl, and the unit is ohm. The relationship between the inductance l and the alternating current frequency f is xl=2πfl, and the inductor can be mainly divided into a high frequency choke coil and a low frequency choke coil.