i have a bunch of old transformers, different sizes and different shapes, but there aren't a lot of identifying marks on them. i've seen some youtube tutorials that talk about how to differentiate primary and secondary sides of a transformer. i don't know how to determine the winding ratio, though. is the only way to do this by sending a low-voltage AC signal through it and documenting the step up or step down on the other side?
when measuring the resistance across terminals, what does that information tell you exactly?
when measuring the resistance across terminals, what does that information tell you exactly?