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Why transformer does not work in DC, explain it?(Electrical Engineering Related )

Why transformer does not work in DC, explain it?(Electrical Engineering Related ) 

Grade:12th pass

2 Answers

Arun
25750 Points
5 years ago
Direct current(DC) has no time varying field because current is constant as well as there is no relatively motion between coil and core(magnetic circuit) of the transformer. So there is no induced emf in secondary coil of the transformer. Transformer fails to transfer power from primary to secondary.
Rajdeep
231 Points
5 years ago
HELLO THERE!
 
A transformer works on the principle of Electromagnetic Induction: which says that the current passed through the primary coil will be transformed and flow through the secondary coil if there is a change in magnetic flux linked with the coil. As we know, the direction of flow of AC current changes periodically, there is a change in magnetic flux linked with the coil. Hence, current flows through the secondary coil.
 
If it is a Step up Transformer, then the EMF of the current flowing through the secondary coil is higher.
 
Transformer does not work with DC current. The reason is that, in DC current, the direction of charge flow is constant, due to which there is no change in magnetic flux linked with the coil: hence, we get no current through the secondary coil.
 
HOPE MY ANSWER IS SATISFACTORY...
THANKS!

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