Inductor is an element that can convert electrical energy into magnetic energy and store it. The structure of the inductor is similar to that of a transformer, but it has only one winding. The inductor has a certain inductance, it only hinders the change of current. If the inductor is in a state where no current is flowing, it will try to block the current from flowing through it when the circuit is on; if the inductor is in a state where current is flowing, it will try to maintain the current when the circuit is off. Inductors are also called chokes, reactors, and dynamic reactors. Inductors are generally composed of skeletons, windings, shields, packaging materials, magnetic cores or iron cores.
 

The characteristics of an inductor are exactly the opposite of those of a capacitor. It has the characteristic of preventing the passage of alternating current and allowing direct current to pass smoothly. The resistance when a DC signal passes through the coil is that the resistance and voltage drop of the wire itself is very small; when an AC signal passes through the coil, self-induced electromotive force will be generated at both ends of the coil, and the direction of the self-induced electromotive force is opposite to the direction of the applied voltage, which hinders the passage of AC , So the characteristic of the inductor is to pass direct current and resist alternating current. The higher the frequency, the greater the impedance of the coil. Inductors often work with capacitors in circuits to form LC filters and LC oscillators.
 

Inductors are mainly used in the circuit to filter, oscillate, delay, trap, etc., as well as filter signals, filter noise, stabilize current, and suppress electromagnetic interference. The most common role of inductance in a circuit is to form an LC filter circuit together with a capacitor. Capacitors have the characteristics of "blocking DC and blocking AC", while inductors have the function of "blocking DC and blocking AC". If the direct current accompanied by many interference signals is passed through the LC filter circuit, the AC interference signal will be consumed by the inductance into heat; when the pure DC current passes through the inductor, the AC interference signal in it will also become magnetic induction. And heat energy, the higher frequency is most likely to be impedance by the inductance, which can suppress the higher frequency interference signal. Inductors have the characteristics of preventing alternating current from passing through and allowing direct current to pass smoothly. The higher the frequency, the greater the coil impedance. Therefore, the main function of the inductor is to isolate and filter AC signals or form a resonant circuit with capacitors and resistors.
 

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