I hope that this is the right place to ask this question. English isn't my first language. So here is my question. If you are familiar with analog circuits you know about power amplifier. Here is simple schematic.
So there are 2 steps in the power amplifier the first one amplifies the voltage(U) and the second one the current(I). Whats the name of the second step. In my language we call this final step with/without transformer but when I search for this in WWW I don't find anything. I will be very grateful if somebody answer to my question.