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Question

Can a transformer work when it is connected to d.c. source ?

Solution
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If DC supply is given to the primary coil of Transformer then DC current flows through primary winding which is constant (time invarient). For production of emf in any winding, the current flowing through that must be sinusoidal.
Induced emf E=L×(dI/dt).
So in the given case ie, for DC input, no emf produced in primary winding. So net voltage in the primary winding will be (Vin-0) more due to which primary winding draws more current which leads to burning of winding.

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