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Mains Electricity When people first started looking carefully at what electricity was they decided it was something to do with particles carrying charge in a wire. They decided that they thought positive particles started at the positive side of a circuit and worked their way around until they reached the negative side of the circuit. This idea worked very well and allowed people to predict what would happen in electric circuits. It was sometime later though that they discovered that these particles were electrons and that they were negatively charged. The only way electrons can carry charge around a circuit is from the negative to the positive. This is because positive charges attract negative charges. Negative charges repel negative charges. In a metal it is only the electrons that carry charge around a circuit. The idea that positive charge flows around a circuit is called conventional current. Electrons carry charge in...

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