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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.
Step-up transformers:
Increase voltage.
Have more coils on the secondary than on the primary coil.
Step-down transformers:
Decrease voltage.
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.
3.…read more



Very useful and straight to the point. Thank you !!

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