Why DC current is not used in transformer?
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Answer Posted / koppu chowdaiah
Transformer is working based on the electromagnetic induction. It is static device.If we apply dc voltage to the transformer the relative motion b/w the core & flux is zero.Hence no emf will be induced.And at the same time the reactance of the tr is zero.so it acts as short circuit hence high current will flow. hence the transformer primary wdg is burnt.but the secondary wdg is safe.
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