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When you have black and white wires wich one is positive and negative?

does it matter if there copper or white? sime of the white wired are copper and some are white and also the black ones some are copper? which one is which? can you connect copper with the white wires together?

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In my opinion I think the black wire is the negative and the white wire is the positive. In DC circuits, positive wires are usually red and negative wires are usually black. In AC circuits, positive wires are usually black while negative wires are usually white. You should be careful and read the manual, if available.

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