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How to tell which wire is positive and negative without a multimeter?
I have an AC adapted that I have stripped the wires on and am using for a LiPo charger. How do I tell which wire is which without a multimeter? One of the wires has white words and numbers on it and the wire is a smooth cylinder. The other wire has no markings and it a rigid cylinder. I don't want to buy a multimeter and need to make sure that I attach the right wires. Can I tell by the markings or is there another way to test which wire is which?
2 Answers
- KMALv 65 years ago
If you are talking about the line side wires, the one with the ridge is the neutral. On the load side it would be the negative.
A multi-meter wouldn't tell you a thing. At best it would read continuity (resistance) through the windings in the transformer. But it wouldn't tell you which was hot and which was neutral.
PS, mult-meters can be had for free on an occasion from Harbor freight. Or for less than $10 all over town. Granted, cheap units aren't as accurate and won't hold up well to any sort of abuse, but they are OK for general house hold use.
- Jim WLv 75 years ago
Cheap multi meter can be purchased for less than $20 US. Either buy one or buy new equipment that is properly terminated.
