why dc power can not be used in transformer?
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Answer Posted / syed shareef
the nessacity to produce emf there must be change in flux.
in ac the sine wave changes with the time so resulting flux
also have time change due this emf produce.
but in dc there is no change in flux or there is no change
in time with wave so it unable to produce emf with it self
if any other means you are going to rotate or too fro
motion then you can produce emf
the law is used is fredays law of electromagnetisum
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