Perfect conductor

Japanese: 完全導体 - かんぜんどうたい（英語表記）perfect conductor

An ideal conductor of electricity or heat with infinite conductivity. In the case of electricity, in the differential form of Ohm's law i = σ E , which shows the relationship between current density i and electric field E , the electrical conductivity σ becomes infinite, and there is no electric field even inside where current is flowing. In this case, a perfect conductor is equipotential including the surface, and the current flows in and out perpendicular to the surface. In other words, a perfect conductor in a current field plays a role equivalent to a conductor in a static electric field.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

伝導度が無限大である電気または熱の理想的導体。電気の場合，電流密度 i と電場 E との関係を示す微分形のオームの法則 i＝σE において，電気伝導度 σ が無限大となり，電流が流れている内部でも電場がない。この場合，完全導体は表面を含めて等電位であり，電流は表面に垂直に出入りする。すなわち電流の場での完全導体は，静電場における導体に相当した役割を果たす。

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