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Electrical current is the movement of free electrons. A free electron is one that has been forced lose of it's orbit and is drifting between the other atoms. If you were to put a peace of metal between the terminals of a car battery it would conduct a a lot of current, but a peace of wood, hardly any, if any at all, the reason being, the electrons are not so easy to force out of they're orbits as the metal, so wood makes a good insulator because it is not a good conducter of electrical current, or it is, on a common scale adverse to the movement of free electrons.

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14y ago

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