Im sure this will help you out:https://www.youtube.com/watch?v=0vMvCVyOp9gThe key is " R=V/I If "I" (current) is = 1Amp, the resistance will be equal to the voltage.
Is it safe to use this method to find a short on the motherboard if I limit the voltage 1.2V and current 1A?I have vcore shorted to the ground somewhere.
I wouldn't recommend 1 A amp with a motherboard or any regular low-power circuit board, at least not on a routine basis. It's one thing to test a wire, motor, or transformer with 1 Amp or more, but you could burn a trace off a board, or fry a component with reverse voltage, etc.However, I might be OK occasionally if the board is dead and you've got nothing to loose... I've used a high current power supply to burn-off a power-to-ground short a couple of times, but most of the times I've tried it, that doesn't work. And even if that does clear the short, you don't always see where it was and you may leave a very-small gap that can get shorted again. I've got a 4-wire meter at work and although I've never measured it's current, I'm sure it no more than a standard multi-meter and perfectly safe for any components.