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Transformers


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Alternating current in primary coil induces a changing magnetic field in the iron core which then induces an alternating potential difference across the ends of the secondary coil.
How does a transformer work?
In the secondary coil
In a step-up transformer, where is the potential difference greater?
the power output
If the transformer was assmed to be 100% efficient, the power input would equal...
In the primary coil
In a step-down transformer, where is the potential difference greater?
50 Hertz to 200 Hertz
From how many Hertz does a switch mode transformer work?