Working Principle of A Transformer
- A transformer consists of a primary coil and a secondary coil wound on a soft iron core.
- When an alternating current flows in the primary coil, a changing magnetic flux is generated around the primary coil.
- The changing magnetic flux is transferred to the secondary coil through the iron core.
- The changing magnetic flux is cut by the secondary coil, hence induces an e.m.f. in the secondary coil.
- The magnitude of the output voltage can be controlled by the ratio of the number of primary coil and secondary coil.
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