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why dc power can not be used in transformer?

Answers were Sorted based on User's Feedback

why dc power can not be used in transformer?..

Answer / sirisha

if dc supply is given to transformer there will be no
change in the flux with there is no emf induced in
the primary and secondary windings.and hence tranformer
action will not take place.

Is This Answer Correct ?    173 Yes 19 No

why dc power can not be used in transformer?..

Answer / jaya bharath reddy

generally, transformer o/p is come by mutual induction i.e,
flux produced in primary coil causes the flow of current in
secondary coil. mainly, flux is produced by time varying
fields i.e, ac signal since the ac signal is time variant
but dc signal is time invariant signal it is constant all
the values of time . so, flux is not produced in the
primary coil consequently no flow of current in secondary



Is This Answer Correct ?    61 Yes 13 No

why dc power can not be used in transformer?..

Answer / sagaya prabhu

Transformer is mutual induction device , No induction
Effect is acted in D.C Supply . & if you give a D.C supply
to transformer windings the windings will be burn out ,
because of static EMF is produced by D.C Supply.

Is This Answer Correct ?    46 Yes 9 No

why dc power can not be used in transformer?..

Answer / jinen dand

Transformer works on Mutual Induction principle. Mutual
induction principle works only on Ac suppy.
So dc power cannot be used in transformer.
If dc power is supplied to transformer following things
will happen
1. if winding resistance is low then according to ohm law
high current will flow through winding which will cause
high temp rise if supply sustains then winding may get
2. If winding resistance is high compare to applied voltage
then only contant flux around winding will be there.

It is very good question..........

Is This Answer Correct ?    37 Yes 5 No

why dc power can not be used in transformer?..

Answer / zahid ali

the basic principle of transformer operation is mutual
induction & there is no mutual induction in DC

Is This Answer Correct ?    39 Yes 9 No

why dc power can not be used in transformer?..

Answer / 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

Is This Answer Correct ?    18 Yes 3 No

why dc power can not be used in transformer?..

Answer / rajesh babu

we cant use dc power in a transformer.there are two main
reasons supporting above statement
1)there will be no action of transformer(as it works on
principle of mutual induction)
2)winding of the transformer acts as inductor&it acts as
short circuit for DC
inductive reactance XL=2*PI*F*L
Deu to this winding of the transformer may burns out.

Is This Answer Correct ?    10 Yes 0 No

why dc power can not be used in transformer?..

Answer / malghani

ac power suply cause indused emf and flux due to magnatic
induction.but in dc case there is no cut off magnatic line
and no flux we use AC power supply.

Is This Answer Correct ?    11 Yes 2 No

why dc power can not be used in transformer?..

Answer / ilaya

dc power can't used in transformer. because dc power is
unidirectional.basicaly emf induced in two way,
1).condctor is stationary and flux is rotating.
2).flux is stationary and condctor is rotating.
so dc supply give to transformer,it produce stationary
magnatic field and also conductor is no emf
induced in secondary.if dc supply maintain to the
transformer heat is produced(transformer windings are low
resistance).finaly windings are transformer is not
working in dc power.
(incase ac supply flux is rotating(rotating magnatic field)
and conductor is emf is produce in secondary

Is This Answer Correct ?    10 Yes 1 No

why dc power can not be used in transformer?..

Answer / subba lakshmi

DC current should not be given to TFR bcoz in it frequency
is zero due to which the reactance which is given by
2*pi*f*l will be zero hence the entire voltage applied is
opposed only by the resistance fo the wire which is nearly
zero hence current produced will be high as v=I*R hence due
to which there are chances of melting wire.

Is This Answer Correct ?    8 Yes 3 No

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