Are there transformers with a choice of voltage (and amperage)?

Question

Electronics

To connect it to an outlet, and at the output it gave out a given (so that it could be regulated) voltage and current.

Answer 1

Do you want constant or variable? There are laboratory sources of direct current, for every taste, multichannel

Answer 2

in a conventional power supply, the current can only be limited by a corresponding decrease in the output voltage. those. give out no more than 2A.
or make a current source, but is it needed in your particular case??