Question

Why transformer is used in ac supply system circuit in instead of dc?

Answer 1

Explanation:

A transformer cannot be used with the direct current (D.C.) source because if the current in primary coil is constant then there will be no change in number of magnetic field line linked with secondary coil and hence no e.m.f will induced in the secondary coil.

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Answer 2

Answer:

Since high voltages are more efficient for sending electricity great distances, AC electricity has an advantage over DC. This is because the high voltages from the power station can be easily reduced to a safer voltage for use in the house. Changing voltages is done by the use of a transformer.