Discussion
True or false: a transformer can change the frequency of a supply.
Answer: D
Correct answer: False, since both windings link the same alternating flux
The frequency of the secondary emf is the frequency at which the common flux alternates, which is the frequency of the supply. A transformer changes voltage, current and apparent impedance, but nothing in it can change the rate at which the flux reverses. Changing frequency requires a rotating machine or a power electronic converter.
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