When there is an electric current in the coil, a magnetic field is generated around the coil. When the current in the coil changes, the magnetic field around it also produces a corresponding change, the change in the magnetic field can make the coil itself generated induction electromotive Force (EMF) (electromotive force to indicate the source of the ideal power supply voltage), this is the induction.
With the wire around the system, with a certain number of turns, can produce a certain amount of inductance or mutual inductance of electronic components, often called inductance coil. In order to increase the inductance value, improve the quality factor, reduce the volume, often add ferromagnetic material made of iron core or magnetic core. The basic parameters of inductor are inductance quantity, quality factor, intrinsic capacitance, stability, current and frequency of use, etc. An inductor consisting of a single coil is called an inductive device, and its self inductance is called the self inductance coefficient.
When two inductance coils are close to each other, the magnetic field of an inductance coil will affect the other inductance coil. The size of the mutual inductance is determined by the inductive coil and the coupling of two inductance coils, and the components made by this principle are called transformers.
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