A perfect conductor has zero electrical resistance for any level of current, associated magnetic field, or operating temperature. A perfect conductor does not exist in the real world.
A Type 1 superconductor behaves as a perfect conductor, but only when used below its critical temperature and critical magnetic field. It abruptly changes into a normal (imperfect) conductor, with non-zero electrical resistance, when the external magnetic field or operating temperature exceeds critical levels which are unique for each superconducting material.
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Explanation:
There is indeed a difference.
A perfect conductor has zero electrical resistance for any level of current, associated magnetic field, or operating temperature. A perfect conductor does not exist in the real world.
A Type 1 superconductor behaves as a perfect conductor, but only when used below its critical temperature and critical magnetic field. It abruptly changes into a normal (imperfect) conductor, with non-zero electrical resistance, when the external magnetic field or operating temperature exceeds critical levels which are unique for each superconducting material.
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