Answer / arpit gaur

because d.c have constant magnitude,if we give supply to the primary winding the flux produced in the core will noy vary therefore no emf will induced in the secondary winding....

Answer / sunitsaini@interview.com

bcoz d.c. is not sinosodial and the current is not change so

Answer / muhammad shoaib

because dc cann't produce flux so no current produce on the
secondary coil of the transformer.

Answer / shahin azad

transformer works on the concept of induction(mutual
inction);if we supply voltage at primary side of a
transformer secondary side of it is induced by the primary
side. and induction is produced due to random magnitude of
current inside of it. DC has a constant magnitude which is
unable to make a magnetic flus/ induction.
That's why transformer cant work at DC.

Answer / vinod yadav

transform work on the principle of electro magnetic induction which states that when an alternating current applied across the primary winding of transformer then an alternating flux will produced which link to secondary winding of transformer results in emf generated in secondary winding , if secondary winding is closed then a current start flowing .
if we apply dc then flux will also produced but it is not alternating type which is most important condition for the operation of transformer

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