I think I am a bit confused here. How does higher current output power supply differ from high voltage supply? Is it just the internal resistances of the supply? For example a Lithium Ion battery from an Alkaline battery. I am asking coz, I was reading about static. Your body can charge upto 15000V which results in a spark when you get near a grounded conductor. so what makes high voltage high, is the number of charges with respect to ground?