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Is the copper on electric wire negative or positive? Answered

On elecric wire there are two kinds of metal. One is copper and the other is iron. Okay, now on a battery there is the positive side (+) and the negative side (-). Wich wire goes where?

Discussions

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Dr.Bill
Dr.Bill

10 years ago

Red is positive black is negative. Search Instructables for a Polarity Checker.

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NobodyInParticular
NobodyInParticular

10 years ago

If one end of the wire is attached to some gadget, then obviously you have to read the directions or pull out your multitester or testing LED. But If you control what attaches to both ends of the wire, the choice is totally arbitrary. Still, you do want to remember what you chose. Standard colors for a pair of polarized wires (jumper cables, for instance) are red for positive and black for negative. So I would pick copper for positive because the copper wire is more red than the other. That is the memory aid I would use.

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sound91
sound91

10 years ago

As said before, it really shouldn't matter. The one thing that you might be thinking of could possibly be when creating a voltage between two metals. The steel or iron is negative, and the copper is positive. This is more or less similar to the basic idea of a battery.

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lemonie
lemonie

10 years ago

Iron? I don't think so, tinned copper maybe.

Like the other guy: wires don't care about +ve/-ve unless you're making electrolytic cells.

L

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fwjs28
fwjs28

10 years ago

it doesn't matter (i think) usually both wires are copper....