What is Transformer? - QS Study
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The electrical device through which the high alternating potential can be changed into low alternating potential and low potential into high potential is called transformer. This device is made on the basis electromagnetic induction. There are two kinds of transformers.

These are –

  1. Step up Transformer: The transformer which converts an electric current of greater strength at a low voltage into an electric current of weaker value at high voltage is known as step up transformer.
  2. Step down Transformer: The transformer which changes the high potential less electric current into low potential much electric current is step down transformer.

A transformer is made on a soft iron core in rectangular form in which two coils of insulated copper wire are inserted in its two opposite limbs. The coil in which an a.c. or emf is applied is known as primary coil. The coil in which an a.c or emf is induced is known as secondary coil.