Power lines. A significant amount of electrical energy is wasted as heat when electricity is transmitted down cables made of traditional metal conductors. Superconductors, however, can conduct electricity with zero electrical resistance and would therefore be vastly more efficient.
Transport. Magnetically levitated trains already exist. Using superconducting magnets, cheaper, faster and more efficient variants could be produced.
Electronics. By harnessing the Josephson effect, extremely fast electronic switches could be constructed, allowing faster microprocessors to be built.
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