Français
4. Critical current or current density
In a resistive conductor, the current is limited by the Joule effect. In a superconductor, since the current doesn't heat up the material, it could theoretically be infinite. Limits do exist (critical current or current density), but they are generally much higher than those of copper, making superconducting materials formidable electrical conductors.
The transport current is the current imposed by the external circuit.
4.1 Type I superconductors
The notion of critical current derives directly from the critical field. The critical current is the current that produces the critical field at the surface of the material. This is Silsbee's rule. Applied to a cylindrical wire with no external field, this rule gives the critical current as...
The Ultimate Scientific and Technical Reference
This article is included in
Conversion of electrical energy
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Critical current or current density
Irreversibility field
References
The Ultimate Scientific and Technical Reference
