Conductivity vs. Speed

There's no such thing as a perfect conductor ; some materials have a very low band gap.
The band gap ,being the energy difference,obviously changes with speed. (Such shifts have been observed.)

 

This is a rather strange question that will require that you explain yourself a bit more, especially the context. Why would the speed that the conductor is moving affect its conductivity? Is this viewed in the context of special relativity? Or is there a part of solid state physics that you're aiming for?

Zz.

 

The increase in "mass" for electrons is very small, even when it gets close to c. We hardly need to do a lot of mass corrections even for electron accelerators. Furthermore, as with any of the physical properties, the only non-ambiguous values are the ones one measures in the rest frame of the object. When we give you all the masses of various elementary particles that you can find in the Particle Data Book, you'll notice that they don't cite at what speed or velocity these are measured.

Zz.