what is super conductivity?

Question

anonymous · Answer

Is a phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristic temperature

anonymous · Answer

mmuo is right!
In simpler terms, you know that any material that conducts electricity faces resistance right? Due to this, some energy is lost to overcome the resistance. A superconductor wouldn't face that problem because it has no resistance.

anonymous · Answer

It is the process by which formation of a zero electrical resistance by changing the temperature (such as using Liquid nitrogen in the lab). Most of these material are like copper and silver. Ref: http://en.wikipedia.org/wiki/Superconductivity