well the power stays the same.

you either have high v primary and a low v secondary or a low v primary and a high v secondary and the current is proportional.

frequency is irrelevant for the most part irrelevant for this word.

magnification simply means step up/down and activity means watts according to raui and the activity I dont think I have a problem with except that the term watts should be used since we are not living in 1901.