Transformer

 The transformer is converting AC voltage, current and impedance of the device, when the primary coil with AC adapter schematic flow, the core (or cores) generates an alternating magnetic flux in it, so that the secondary coil induces a voltage (or current ). Transformer by a core (or cores) and coil assembly
A, two or more coil  air circuit breaker , which is called the primary winding connected to the power supply coil, called the secondary circuit breakers  of the other. In a generator,  Air circuit breaker of the coil moves through the magnetic field or a magnetic field moves through the stationary coil, can EMF induced in the coil, in both cases, the magnetic Pass values ​​unchanged, but the quantity of a magnetic flux intersecting the coil there is change, it is the principle of mutual induction. Transformer is an electromagnetic mutual inductance, transform voltage, current and impedance of the device.