computer power supply

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i have old computer , see has computer power supply. (no kidding) read out put values , see says 5 volts 30 amps. know if touch 5 volts , ground on arduino, nothing happens don't fell it. happens if touch 5 volts 30 amps? feel because of amps? , short cause dangerous sparks? information computer power supplies appreciated.

in essence, 5v @ 30 amps max deliver on demand, never forces 30 amps out of 5v line(s)


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