1. The problem statement, all variables and given/known data What would be the output of a transformer plugged into a DC voltage source by mistake? 2. Relevant equations N/A 3. The attempt at a solution Judging from the phrasing of the question, I am assuming that a transformer should not be plugged into a DC voltage source but rather AC voltage. I do not know anything about transformers, but I would think that doing this by mistake would either cause the transformer to short or nothing at all would happen. Is this correct?