Current blocking effect of inductive coil
The current has a positive and negative name, and the inductance coil also has a blocking effect. Everything has two sides. Now we know that the inductance coil has a current blocking coil. Current blocking does not sound like a good word. How about it? Let's learn:
Current blocking effect of inductance coil: the self induced electromotive force in the inductance coil is always resistant to the current change in the coil. The inductance coil has a blocking effect on the AC current. The size of the blocking effect is called inductive reactance XL, and the unit is Ohm. Its relationship with inductance L and AC frequency f is XL = 2 π fl. inductors can be mainly divided into high-frequency choke coil and low-frequency choke coil. Function of tuning and frequency selection: LC tuning circuit can be composed of inductance coil and capacitor in parallel. That is, if the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non AC signal, the inductive reactance and capacitive reactance of the circuit are also equal, so the electromagnetic energy oscillates back and forth in the inductance and capacitance, which is the resonance phenomenon of the LC circuit. During resonance, the inductive reactance and capacitive reactance of the circuit are equal and reverse. The inductive reactance Z of the total circuit current is small and the current amount Z is large (refers to the AC signal of F = "F0"). The LC resonance circuit has the function of selecting the frequency and can select the AC signal of a certain frequency f. Many things can not be measured by good or bad. Just like this inductance coil, it can not be said that the inductance coil is bad because it has the function of blocking current.
