Answer Posted / kamaraj

Transformer is working based on the principals of
Electromagnetic induction when A/c supply applied in the
primary wdg which induces EMF in the Secondary wdg.

While applying DC supply in the primary wdg, it will burnt
if it is Step up transformer, because it acts as Series
motor and it takes high current. and there is no back EMF
induced in the Tr sec. wdg.

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