Another name for the inductance coil inductors, devices to work using the principle of electromagnetic induction. When a current flows through a wire, it will produce a certain electromagnetic field around the conductor, and theelectromagnetic wire and wire of electromagnetic field in the range of theinduction effect. The wire from electromagnetic field has effect, called "self",namely the conductor current change produced by the change of theirmagnetic field, the magnetic field is further affected the electric current in a wire; in other wire produced the electromagnetic range function, called"transformer".

The inductance coil of the electrical characteristics and capacitor instead,"resistance of high frequency, low pass". The high frequency signal through the inductance coil will encounter great resistance, difficult to show through;low frequency signal by which the resistance is small, i.e., low frequency signalcan be easily through it. The inductance coil resistance on DC power is almost zero.

Resistance, capacitance and inductance, they for the electrical signals in the circuit flow will appear a certain degree of resistance, the resistance which we call "impedance" inductance coil presents for current signal is the use of coilinductance. The inductance coil and sometimes we call it "inductor" or "coil",represented by the letter "L". The winding inductance coil, the number of coilswound we call it "the turn number of coil".

Definition: the inductance coil is composed of a circle by a wire enclosurearound the insulating pipe, wire insulation of each other, and the insulating tube can be hollow, can also contain iron or magnetic powder core, referred to as the inductance. With L said, units with Henry (H), don Henry (mH), Wahenry(uH), 1H=10^3mH=10^6uH.

Effect: the sense coil electrical characteristics and capacitor instead,"resistance high frequency, low pass". The high frequency signal through theinductance coil will encounter great resistance, difficult to show through; low frequency signal by which the resistance is small, i.e., low frequency signal can be easily through it. The inductance coil resistance on DC power is almost zero.