Answer Posted / razif mat saat

Short Answer: Nothing will happen

Long Answer: Transformer reacts in AC since the working principle is induction by primary coil to the secondary coil (giving step-up or step down VOLTAGE, depending on number of coil turns in them)

This induction happens if you have rate of change in voltage i.e AC, or at the start of your termination of your DC (from 0V to whatever your DC voltage).

Therefore, in your case, the transformer will act as a transformer only at the beginning of the DC connection (well, think: when you disconnect also...)

During steady state when the DC has stabilized, nothing will happen because there's no rate of change in voltage anymore.

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