why transformer uses ac but not dc?

Asked by Shefali | 1st Feb, 2014, 11:08: AM

Expert Answer:

A transformer is based on the principle of mutual induction, i.e., whenever the current (or magnetic flux) through the coil changes, an emf is induced in the neighbouring coil.
 
Now, dc current is constant with time, so it cannot induce emf in the coils of transformer but a.c. current fluctuates with time, hence the changing current can induce an emf in the coils of the transformer. Thus, a transformer works on a.c. current and not d.c.

Answered by  | 3rd Apr, 2014, 12:49: PM

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