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why dc power can not be used in transformer?
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Answer Posted / deepa james
*When an alternating voltage is given to the primary winding, current flows in it.
*Flow of current causes changing magnetic field in the core.
*Most of which is linked with the secondary winding where an emf is produced due to the change in magnetic field.
*DC voltage is constant in magnitude and if given to the primary winding, there wont be any change in magnetic field. Instead magnetic field stays the same.
*EMF is induced in the secondary only if the magnetic field is changing.
*Thus if DC voltage given to primary, there will be no emf induced in secondary.
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