L
larry moe 'n curly
- Jan 1, 1970
- 0
If a clamp-on ammeter probe is clamped around both the power wires and
the ground wires, shouldn't it read zero amps because the magnetic
fields should cancel?
I recently measured the amps that my computer motherboard drew by
clamping the AC/DC probe around the two yellow +12V wires of the
auxillary 4-pin power connector. The meter read 4.7A, but when I tried
also clamping the two black ground wires on the same cable, the reading
dropped to 2.6A. I taped the wires together and even tried arranging
them to alternate yellow-black-yellow-black, but the reading stayed at
2.6A.
the ground wires, shouldn't it read zero amps because the magnetic
fields should cancel?
I recently measured the amps that my computer motherboard drew by
clamping the AC/DC probe around the two yellow +12V wires of the
auxillary 4-pin power connector. The meter read 4.7A, but when I tried
also clamping the two black ground wires on the same cable, the reading
dropped to 2.6A. I taped the wires together and even tried arranging
them to alternate yellow-black-yellow-black, but the reading stayed at
2.6A.