Principles of Transformer Operation
Physics: Cambridge International GCSE Supplement, topic 4.16.4
Principles of Transformer Operation
Transformers work like this:
Alternating e.m.f
- An alternating e.m.f (e.m.f that is constantly changing direction) is applied to the primary coil of the transformer.
- This alternating e.m.f causes an alternating current to flow through the primary coil.
Changing magnetic field
- The alternating current creates a continuously changing magnetic field in the iron core of the transformer.
- The changing magnetic field in the iron core also passes through the secondary coil.
Secondary coil e.m.f
- The changing magnetic field passing through the secondary coil induces an alternating e.m.f in the secondary coil.
Test yourself on Principles of Transformer Operation
In which part of a transformer is a changing magnetic field induced?