Transformer An A.C. device used to change high voltage low current A.C. into low voltage high current A.C. and vice-versa without changing the frequency In brief, 1. Transfers electric power from one circuit to another 2. It does so without a change of frequency 3. It accomplishes this by electromagnetic induction 4. Where the two electric circuits are in mutual inductive influence of each other.
Principle of operation It is based on principle of MUTUAL INDUCTION. According to which an e.m.f. is induced in a coil when current in the neighbouring coil changes.
Constructional detail : Shell type • Windings are wrapped around the center leg of a laminated core.
Core type • Windings are wrapped around two sides of a laminated square core.