2nd October 2019

meritnation
15

Can you use a transformer to step up a DC voltage?

When a d.c voltage source is applied across the primary of the transformer,the current in the primary coil remains constant. Hence there is no change in the magnetic flux linked with the secondary. Therefore the voltage across the secondary coil is zero.Thus a transformer can't step up dc voltage.

Then, why DC voltage is not used in transformer?

Direct current(DC) has no time varying field because current is constant as well as there is no relatively motion between coil and core(magnetic circuit) of the transformer. So there is no induced emf in secondary coil of the transformer. Transformer fails to transfer power from primary to secondary.

Can DC be applied to a transformer?

Transformer is nothing but a pair of inductor coils which is wound on a magnetic core. If you apply DC to it, there wont be varying magnetic flux, so since there is no change in magnetic flux linking to the coil, emf is not induced on the secondary. So no DC output.
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