In this topic, you study Transformer – Definition, Theory & Diagram.
The transformer is a static device (with no rotating parts) which transfers electrical energy from one alternating current circuit to another with the desired change in voltage or current and without any change in frequency. Through its use, electrical energy can be generated at the economical voltage, transmitted efficiently at the increased voltage and utilized after reducing the voltage again to the value suitable for the particular application. The high voltage, long-distance transmission with the help of transformers has made possible the utilization of electrical energy in one geographical locality from energy sources in others.
The transformers are designed to operate either on single phase or on three phase supply and accordingly are known as single phase or three phase transformers.