What does 2r2 mean on inductance

Inductor is an element that can convert electrical energy into magnetic energy and store it. The structure of inductor is similar to that of transformer, but there is only one winding. The inductor has a certain inductance, which only blocks the change of current. If the inductor is in the state of no current passing, it will try to prevent the current from flowing through it when the circuit is connected; If the inductor is in a state of current flow, it will try to maintain the current when the circuit is disconnected. Inductor is also called choke, reactor and dynamic reactor.

Inductors mainly play the role of filtering, oscillation, delay, notch, etc. in the circuit, as well as screening signals, filtering noise, stabilizing current and suppressing electromagnetic wave interference. The most common function of inductance in circuit is to form LC filter circuit together with capacitance. Capacitance has the characteristic of "blocking DC and connecting AC", while inductance has the function of "connecting DC and blocking AC". If the DC current with many interference signals is passed through the LC filter circuit, the AC interference signal will be consumed by the inductance into heat energy; When a relatively pure DC current passes through the inductor, the AC interference signal in it is also changed into magnetic induction and thermal energy. The higher frequency is most likely to be impedance by the inductor, which can suppress the interference signal of higher frequency. The inductor has the characteristics of preventing the passage of AC and allowing DC to pass smoothly. The higher the frequency, the greater the coil impedance. Therefore, the main function of the inductor is to isolate and filter the AC signal or form a resonant circuit with capacitors, resistors, etc.

The characteristics of inductor are exactly opposite to those of capacitor. It has the characteristics of preventing AC from passing and allowing DC to pass smoothly. The resistance of the DC signal when it passes through the coil is the resistance of the wire itself, and the voltage drop is very small; When the AC signal passes through the coil, the self induced electromotive force will be generated at both ends of the coil. The direction of the self induced electromotive force is opposite to the direction of the applied voltage, preventing the passage of AC. therefore, the characteristics of the inductor are DC and ac. the higher the frequency, the greater the coil impedance. Inductors often work with capacitors in circuits to form LC filters, LC oscillators, etc. In addition, people also make use of the characteristics of inductance to make choke coils, transformers, relays and so on.

Main parameters the main parameters of inductance include inductance, allowable deviation, quality factor, distributed capacitance, rated current, etc.
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