Dc supply to transformer

[dhivakhar]

my friend gave a dc supply to a transformer in my college lab accidentally and the fuse went off can i get an explanation on why this happened?

 

[Jony130]

Transformer work only with AC voltage. For DC transformer act just like a short wire (a very small resistance ).

 

[dhivakhar]

Transformer work only with AC voltage. For DC transformer act just like a short wire (a very small resistance ).

Can you please explain how a transformer shows very small resistance to a DC supply?

 

[Averagesupernova]

Actually this sounds like a disguised homework question. If you are messing with transformers in lab you should already know the answer to the question.

 

[Jony130]

Because transformers is essentially just two or more coils of wire wrapped around the core. And wires has "low" resistance.

 

[zoki85]

my friend gave a dc supply to a transformer in my college lab accidentally and the fuse went off can i get an explanation on why this happened?

You have a careful smart friend

 

[sophiecentaur]

Actually, if your friend had been able to measure the way the current varied around the time of switch on, he would have found that the current value followed a curve, because the Iron core of the transformer behaves like an electromagnet. The magnetic field energy takes time to build up and it produces a 'back emf' which delays the DC current increase (This would be fairly quick with a mains transformer - only a few tens of milliseconds before the fuse started to blow.)