The inductance coil is the main performance index of the inductance quantity. In addition, the windinginductance coils generally has some resistance, the resistance is very small, can be neglected. The smallresistance when the current through the coil in some large in the circuit can not be ignored, because of the high current power consumption in the coil, coil caused by heat and even burn, so some time but also consider the power coil can bear.

Inductance

L said the inductance coil itself inherent characteristic, has nothing to do with the current size. In addition to the inductance coil special (color code inductor, inductance) is generally not specially marked on the coil, and thespecific name label.

Inductive reactance

Hinder the inductance coil of AC current size inductance XL, ohms, symbol. The relationship between it and theinductance L and the frequency of the alternating current of F PI was XL=2 fL

The quality factor

The quality factor Q is a physical quantity of the coil quality, ratio of Q to XL resistance, inductance andequivalent is: Q=XL/R. The Q value of the coil is higher, the smaller the loop loss. Q value of the coil DC resistance of conductor and dielectric loss, skeleton, shield or loss caused by factors of iron core, high frequency skin effect and so on. Coil Q value is typically tens to hundreds of.