please anybody clear my doubt..
one day i said to my friend about energy and i told him that the current produced by a dynamo can use to light up a bulb. so let us take a little bit of its output current to a step-up transformer and can produce much higher current. but he told me "its too shame friend. transformer only increases voltage, not current". is it correct? if yes, please tell me how to increase the current and voltage simultaneously

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