Transformer is converted AC voltage, current and impedance of the device, when the primary coil through AC current, core (or core) generates an alternating magnetic flux in it, so that the secondary coil induces a voltage (or current). The transformer core (or cores) and coil, the coil has two or more windings, wherein the power supply is called the primary coil winding, the secondary winding is called the rest of the winding. In the generator, either the coil moves through the magnetic field or magnetic field moves through the stationary coil, can EMF in the coil, in both cases, the value of the magnetic flux are the same, but there is the number of the magnetic flux intersecting the coil chain change, which is the principle of mutual induction. Transformer is a kind of mutual use of electromagnetic induction, the transformation of voltage, current and impedance of the device.

effect:
Transformer is a static electrical equipment. It is based on the principle of electromagnetic induction, will be a certain level of AC voltage and current into another level of the same frequency of the voltage and current of the device. Role: converting AC voltage, AC current and impedance conversion exchange.