I have a blown 0.5A fuse on a PCB and I tested the voltage between the two contacts after plugging it in and I’ve noticed it’s showing me the voltage that my PSU is rated for.
I know it has something to do with potential difference, but I can’t quite grasp why it’s happening.
Thank you!
In: 0
This is a massive misunderstanding about how multimeters read
Voltage is the DIFFERENCE between 2 points.
So fuses that are good will read 0 volts between the input and output of the fuse. This doesn’t mean it’s safe to touch.
Fuses that are bad will read voltage between in the input and output.
If you hypothetically were able to put a multimeter on a power line up above your house then put the other probe on that same line the reading would be 0.
It would only be if you put the probe on one of the other lines you would see the thousands of volts running through the line.
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