I know that in a step down transformer the voltage is reduced and therefore current has to increase because P=IV. But potential difference is what drives the current so when the voltage decreases it seems strange for the current not to decrease too. Another why of putting it is if both coils were made out of the same material then wouldn't they have the same resistance? and so if they both obey V=IR then when V goes down and R remains the same then I would need to go up but it doesn't. why?