...A material that goes into a superconducting state with no electrical resistance and utilizes this state. Metals are good conductors of electricity, so they are widely used as conductive materials for power lines and magnet coils. Even though they are good conductors, they do not have zero electrical resistance, so when current flows through them, a voltage drop occurs and the resulting electrical energy is converted into heat. In the case of power lines, this heat dissipates into the atmosphere, resulting in transmission losses. Also, when a large current is passed through a magnet to create a strong magnetic field, a large amount of heat is generated, which requires large power supplies and cooling devices. ... *Some of the terminology used in reference to the "in situ method" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…電気抵抗がない超電(伝)導状態となり,その状態を利用する材料。金属は電気の良導体であるから,送電線やマグネットのコイルなどの導電材料として広く使用されている。良導体といっても電気抵抗が0ではないので,電流を流せば電圧降下が生じ,その分の電気エネルギーは熱に変わる。送電線の場合にはこの熱は大気中に放散し,送電損となる。また,マグネットで強い磁界を作ろうとして大電流を流すと,大きな発熱を生じ,そのために大きな電源設備と冷却装置が必要となる。… ※「インシツ法」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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