it's been a while since I figured stuff like this out, but to find out amps you take watts and divide it by the volts
so a 700 watt power supply would draw 700w/110v= almost 6 1/2 amps
of course there is the possibility of a spike in current draw and continuous usage close to the limit is also a consideration
note: I am not an electrician and anything I have said above is just for shits and giggles and should not be used as advice and I take no responsibility for any blown fuses or electrical mishaps
