What would the resistance of a superconductor be?

The resistance of a superconductor is characterized by its unique property of exhibiting zero electrical resistance below a certain critical temperature. When materials become superconductors, they allow electric current to flow without any energy loss, which means that there is no resistive heating. This phenomenon occurs because, in the superconducting state, the electrons form pairs (known as Cooper pairs) that move through the lattice structure of the material without scattering, thus eliminating resistance.

In practical terms, this means that once an electrical current is established in a superconducting loop, it can flow indefinitely without the need for an external power source, as there is no energy dissipation in the form of heat. This exceptional property is what sets superconductors apart from normal conductive materials, which always have some degree of resistance, leading to energy loss.