Inductor is an electromagnetic induction element made of insulated wire wound. Belonging to common elements.
 
Magnetic inductance effects: ring and connecting cables constitute an inductor, which is commonly used in anti-jamming electronic circuit components, high-frequency noise has a good shielding effect, it is called absorption ring, which are usually iron ferrite material, so called ferrite bead (the ring). In the figure, the top one-piece ring, below the belt mounting clamp ring. Ring at different frequencies have different impedance special offerings. Usually in the low frequency impedance is very small, when the signal frequency is increased dramatically increases the impedance of the magnetic ring. Inductance seen such a large role, as we all know, the higher the frequency of the signal, the more likely radiate, and general signal lines are not shielded layer signal lines it would be a good antenna to receive all the surroundings kind of messy high-frequency signal, which signal is superimposed on the original transmission of the signal, and even change the original transmission of the useful signal, seriously interfere with the normal operation of the electronic device, thus reducing electromagnetic interference with electronic equipment (EM) has that must be considered issues. In ring action, even if the normal useful signal can pass through, but also a good to suppress high frequency interference signals, and low cost.
 
Inductive effect: Through DC resistance AC It is simple to say, the AC signal isolation, filtering or capacitors, resistors and other components resonant circuit. Inductive effect also screened signal, filtering noise, constant current and electromagnetic interference suppression role.
Tuning and frequency selection inductance effects: inductor and a capacitor connected in parallel can be composed of LC tuning circuit. I.e., with non-natural oscillation frequency f0 frequency f AC signal circuit are equal, the loop inductance and capacitance are equal, then the electromagnetic energy in the inductor, oscillate back and forth between the capacitor, which is the LC circuit resonance phenomenon. Because the resonant inductance and capacitance equivalent circuit and reverse, so the total loop inductance current minimum, maximum amount of current (ie f = f0 AC signal), so the LC resonant circuit has the effect of frequency selection, can AC signal of a frequency f selected.