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Strictly speaking, its ability to carry electrical charge from one place to another. Most metals, like copper, have several electrons available in their outermost shells that are easily "pursuaded" to accept and release electrons along a specific path, like a wire. The more easily they do this the better conductor they are. So, when you apply an "electromotive force" like the voltage difference of a battery, it basically pushes electrons in one end of the wire and pulls them out the other (which, incidentally is an exothermic process, so the wire and battery feel warm).

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16y ago

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