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Principle of impedance, capacitive reactance and inductive reactance_Inductance coil_Electromagnetic coil

Impedance, capacitive reactance, and the principle of inductive reactance

In circuits with resistance, inductance, and capacitance, the blocking effect on alternating current is called impedance. The impedance is usually indicated by Z. The impedance consists of resistance, inductive reactance and capacitive reactance, but not the three are simply added together. The unit of impedance is Europe. In direct current, the effect of an object on current blocking is called resistance. All materials in the world have resistance, and only the magnitude of the resistance is different. Substances with low electrical resistance are called good conductors, such as metals; materials with high electrical resistance are called insulators, such as wood and plastic. There is also a conductor between the two called a semiconductor, and a superconductor is a substance with a resistance value close to zero. However, in the field of alternating current, in addition to the resistors blocking the current, the capacitors and inductors also block the current activity. This effect is called reactance, which means the effect of resisting current. The reactance of capacitors and inductors is called capacitive reactance and inductive reactance, which is referred to as capacitive reactance and inductive reactance. Their unit of measurement is the same as the resistance, and the value of the value is related to the frequency of the alternating current. The higher the frequency, the smaller the capacitive reactance and the greater the resistance. The lower the frequency, the larger the capacitive reactance and the smaller the inductive reactance. In addition, the capacitive reactance and the inductive reactance have the problem of the phase viewpoint, and have a vector connection, so that the impedance is the sum of the resistance and the reactance in the vector. With regard to a detailed circuit, the impedance is not constant, but changes with frequency changes. In a series circuit of resistors, inductors, and capacitors, the impedance of the circuit is generally greater than the resistance. That is, the impedance is reduced to a minimum. In an inductive and capacitive parallel circuit, the time-division impedance of the resonance increases to a maximum, which is the opposite of the series circuit.
Inductive reactance can also pass through the coil, but the inductance of the coil has a blocking effect on the alternating current. This blocking is called inductive reactance. The more difficult it is for AC power to pass through the coil, the greater the inductance, the greater the blocking effect of the inductor; the higher the frequency of the AC, the more difficult it is to pass through the coil, and the blocking effect of the inductor is also large. Tests have shown that the inductive reactance is proportional to the inductance and proportional to the frequency. If the inductive reactance is indicated by XL, the inductance is indicated by L, and the frequency is indicated by f, then the unit of XL = 2πfL inductive reactance is Europe. Knowing the frequency f (Hz) of the alternating current and the inductance L(H) of the coil, the inductive reactance can be calculated by the above equation.

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