calculating my power needs

thank you i wasn't sure if you added the amps together or the voltage or resistance or some combination thereof

ok next question is there an easy way to lower voltage while increasing amprage? i have a few printer powersupplies

2 32v 375ma / 16v 500ma
1 30v 0.4a
i have a few more somewhere in my "oooooo save it box" but can't locate them this min