Electric Potential and Electric Fields

[IKonquer]

Lets say you have a hollow sphere, which is a conductor, and you put some charge on it. I understand why the electric field inside the sphere is 0, but I don't see why the electric potential V is constant.

Could someone explain?

Thanks

 

[SammyS]

$$\Delta V=-\vec{E}\cdot d\vec{\ell}$$