Inductance

When the coil passes current, a magnetic field induction is formed in the coil, which in turn generates an induced current to resist current flow through the coil. We refer to this interaction of current and coil as the electrical inductive reactance, which is the inductance, in units of "Henry" (H). Inductive components can also be made using this property.

The inductor is usually represented by "L" plus a number in the circuit. For example, L6 represents the inductor number 6. The inductor coil is made by winding the insulated wire around the insulated bobbin by a certain number of turns. DC can pass through the coil. The DC resistance is the resistance of the wire itself. 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 applied voltage, which hinders the AC. Pass, so the characteristic of the inductor is DC resistance AC, the higher the frequency, the greater the coil impedance. The inductor can form an oscillating circuit with the capacitor in the circuit. Inductors generally have a straight-label method and a color-code method, and the color-code method is similar to a resistor. Such as: brown, black, gold, gold means 1uH (error 5%) of the inductance.

The basic unit of inductance is: Hen (H) The conversion unit is: 1H=103mH=106uH.