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A transformer consists off a primary and secondary coil wrapped
round the same iron core.
They only work with a.c.
Transformers are used in the national grid.
Have more coils on the secondary than on the primary coil.
Have more coils on the primary than on the secondary coil.
How they work:
1. An alternating current passes through the primary coil.
2. This produces an alternating magnetic field.