Why transformer does not work on DC power supply ? | Transformer on DC supply

To discuss about why transformer does not work on DC power supply ? first of all it is necessary to know about working principle of transformer. we will discuss in briefly;

Working principle of transformer:
OR
How transformer works on AC supply ?

When the primary winding is connected to an ac supply mains, a current flows thorough it. Since this winding links with an iron core, current flowing through this winding produces an alternating flux in the core. Since this flux is alternating and links with the secondary winding also, induces an emf in the secondary winding.

The frequency of induced emf in secondary winding is the same as that of the flux or that of the supply voltage. The induced emf in the secondary winding enables it to deliver current to an external load connected across it. Thus the energy is transformed from primary winding to the secondary winding by means of electromagnetic induction without any change in frequency.

Now; you can understand how to transformer is works.
Now, come back to the our question.

Transformer on DC supply. 
OR 
what happens if the transformer connected to the dc supply ?

If a rated dc voltage is applied to the primary of a transformer, the flux produced in the transformer core will not vary but remain constant in magnitude and, therefore, no emf will be induced in the secondary winding except at the moment of switching on.

 Thus the transformer is not capable of raising or lowering the dc voltage. Also there will be no self-induced emf in the primary winding, which is only possible with varying flux linkage.

To oppose the applied voltage and since the resistance of primary winding is quite low, a heavy current will flow through the primary winding which may result in the burning out of the primary winding.