Hollow self-adhesive coil is a device uses the principle of electromagnetic induction to work. When a current flows through a wire, it will produce a certainelectromagnetic field around the conductor, and the electromagnetic wire andwire of electromagnetic field in the scale in the induction effect. The wire fromelectromagnetic field has effect, called the "self", namely the conductor current change produced by the change of their magnetic field, the magnetic field is further affected the electric current in a wire; in other wire produced theelectromagnetic scale effect, called "transformer".

Hollow self-adhesive coils of electrical characteristics and capacitor instead,"resistance high frequency, low pass". The high frequency signal through theinductance coil will encounter great resistance, it is difficult to pass through;and the low-frequency signal through it when the resistance is relatively small,i.e., low frequency signal can be relatively simple after it. The inductance coilresistance on DC power is almost zero.

Resistance, capacitance and inductance, they regarding the electrical signal in the circuit flow will appear a certain resistance, the resistance we call for the use of "impedance" inductance coil which appears on the current signal is the coil inductance. The inductance coil and sometimes we call it "inductor" or "coil", represented by the letter "L". The winding inductance coil, the number ofcoils wound we usually call it "the turn number of coil".

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