Transformer Principle

Transformer is a device to change AC voltage, current and impedance. When AC current is applied to primary coil, AC flux is generated in iron core (or magnetic core) to induce voltage (or current) in secondary coil. The transformer consists of iron core (or magnetic core) and coil. The coil has two or more windings. The winding connected with the power supply is called primary coil, and the other windings are called secondary coil. In the generator, no matter the coil moves through the magnetic field or through the fixed coil, it can induce the potential in the coil. In both cases, the value of the flux remains unchanged, but the quantity of the flux in the coil intersection chain varies, which is the principle of mutual induction. Transformers are devices that use electromagnetic mutual inductance to transform voltage, current and impedance.