what will happen if we give a dc supply to a transformer.?
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Answer Posted / mayilsamy ranganathan
When Dc supply is given to primary of transformer it draws
heavy current from the DC source due to absence of back emf
and burnt out.Because the dc current not varying with time
it has constant value throught the period.
(AC is given to transformer the sinusoidaly varying
current creates a sinusoidaly varying flux ,this flux cuts
the stationary primary coils and creats a back emf,
(statically induced emf)this back emf opposes the applied
voltage source to drive current(Lenz law) so current is
limited by this back emf hence no overdrawal of current
from source,this is not happen while applying dc)
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