Output of a transformer plugged into a DC voltage source by mistake?

[w3390]

Homework Statement

What would be the output of a transformer plugged into a DC voltage source by mistake?

Homework Equations

N/A

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?

 

[Delphi51]

Transformers work on these two principles:
- a current causes a magnetic field around it
- a changing magnetic field causes an electric field around it, which tends to create an electric current in a conductor

The transformer works as long as the primary current is changing, which it will be for a very short time until the DC current stabilizes. So you will get some output for a millisecond or two, then nothing.

Your thought that their could be a short circuit makes sense. The DC will not notice the reactance of the primary coil, so the current may well be too large.

 

[nlightner]

Yes, your understanding is correct. A transformer is designed to work with AC voltage, which constantly changes direction. Plugging it into a DC voltage source would not allow the transformer to function properly, as it relies on the changing magnetic field created by the alternating current. This could potentially cause the transformer to short, resulting in either no output or a damaged transformer. It is important to always use the correct voltage source for any electronic device to ensure safe and proper operation.