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Most conductors have resistance, which causes two problems: you lose energy in the conductor, so you need more electricity than you would with no resistance in the line, and you gain heat. Superconductivity is a property of some conductors where there is no resistance. Because superconductivity requires extremely low temperatures to work, only in places where you cannot have any losses at all--like cyclotrons--do you use superconductors.

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13y ago

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