First, the occasion of the application of inductor.

Attention should be paid to moist and drying, concave and convex ambient temperature, high-frequency or low-frequency environment, rational inductance or impedance characteristics, etc.
Second, the frequency characteristics of inductors.
At low frequency, the inductor usually has the characteristics of inductance, which only plays the role of energy storage and high frequency filtering.
But at high frequency, its impedance characteristic is very obvious. There is a phenomenon of energy consumption and heat, and the rational effect is reduced by one level. The high frequency characteristics of different inductors are different.
The inductance of ferrite material is explained below:
The ferrite material is Fe-mg alloy or Fe-Ni alloy, which has high magnetic conductivity, so the capacitance between the inductor coils and windings is the smallest under the condition of high frequency and high resistance. Ferrite materials are usually used at high frequency, because they are mainly inductive at low frequency, making the on-line loss very small. In the case of high frequency, they mainly show the reactance characteristic ratio and change with the frequency. In practical application, ferrite materials are used as high frequency attenuators in RF circuits. In practice, ferrite is better equivalent to the parallel connection of resistance and inductor. the resistance is short-circuited by inductor at low frequency and the inductance impedance becomes so high at high frequency that the current passes through the resistance. Ferrite is a consuming device on which high-frequency energy is converted into thermal energy, which is determined by its resistance characteristics.

一、电感运用的场合
    湿润与枯燥、环境温度的凹凸、高频或低频环境、要让电感体现的是理性，仍是阻抗特性等，都要留意。
二、电感的频率特性
    在低频时，电感通常出现电感特性，即只起蓄能，滤高频的特性。
    但在高频时，它的阻抗特性体现的很明显。有耗能发热，理性效应降低一级现象。不相同的电感的高频特性都不相同。
    下面就铁氧体材料的电感加以说明：
    铁氧体材料是铁镁合金或铁镍合金，这种材料具有很高的导磁率，所以电感的线圈绕组之间在高频高阻的状况下发生的电容小。铁氧体材料通常在高频状况下运用，因为在低频时他们首要呈电感特性，使得线上的损耗很小。在高频状况下，他们首要呈电抗特性比而且随频率改变。实践运用中，铁氧体材料是作为射频电路的高频衰减器运用的。实践上，铁氧体较好的等效于电阻以及电感的并联，低频下电阻被电感短路，高频下电感阻抗变得相当高，以至于电流悉数经过电阻。铁氧体是一个消耗设备，高频能量在上面转化为热能，这是由它的电阻特性决议的。