Transformer current restriction? Answered
I am aware mostly how transformers (AC - AC) work, but I am lest informed on a few key parts. I know there is a direct relationship between windings and voltage as well as an inverse relationship between voltage and amperage. The thing I don't understand is what limits the current produced by the transformer. I know you can keep droping the secondary windings to increase amperage, but eventually you get to a point you can no longer do that. To overcome this one can use three sets of windings wired in parallel which will retain voltage but increase amperage. The amount of amperage is still limited to the maximum throughput of the primary, but how do you actually find this out. If one wanted to make a variable current AC welder, it would be relatively easy to predict the voltage, but establishing a potential amperage is more difficult. What actually establishes the maximum output of a transformer because in some cases the max current is reached long before the actual failure, and is there a way to predict the end product.
P.S. I am not looking for the answer they use voltage/current limiting circuts ect... I am looking at something like a pole pig which maxes out output before internal failure and contains no additional circutry, not a wall wart