Question

Can a step up transformer be used as a step down transformer?

Answer 1

Answer:

So yes, you can run a transformer "backwards". Talking about electrical transformers, a step up transformer is used to produce an output with a higher voltage and lower current than the input. A step down transformer is used to produce an output with lower voltage and higher current than the input.

Answer 2

Answer:

Yes You can. Step down transformer is step up if you swap the primary with Secondry. But power & voltage level should be same for respective windings.

Explanation: