How do surface currents differ between a superconductor and normal conductor?

[lufc88]

What happens to the electric field of a superconductor that is different to a normal conductor when electricity is going through it anything?

Why do surface currents occur on a superconductor are they normally there on a normal conductor?

 

[Drakkith]

Does this help?
http://en.wikipedia.org/wiki/Meissner_effect