View Whats A Transformer UK . A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits. A transformer is a device that uses the principles of electromagnetism to convert one voltage or current to another. National Grid Power Supply Electricity Explaining Use Of Transformers Formula Theory Calculations Pylons Versus Underground Cables Igcse Gcse Physics Revision Notes from docbrown.info A transformer is a device which transfers electric current from one circuit to another, usually by the principal ofmutual induction. When the number of turns of the secondary coil is greater than that of primary coil, such a. Transformer means that electrical energy by two or more coils and electrical inductance of a circuit to another circuit via transfers. A control transformer is a small step down transformer is used in the ...