What are the roles of the electrodes and potentiostat in cyclic voltammetry?

[higherme]

I'm trying to find out the roles of the following for cyclic voltammetry:
working electrode
auxiliary electrode
reference electrode
and potentiostat

I kind of found out what they are.. but i am not sure of its exact role, like for the working electrode, it is the electrode at which the redox reaction of interest occurs, but what does it actually do, and what happens there.

any one can give me any sites, I've tried google many times but didn't find much

Thanks a lot!

 

[Gokul43201]

http://www.currentseparations.com/issues/14-2/cs14-2d.pdf

But if you have fundamental queries, you should probably start here: http://www.prenhall.com/settle/chapters/ch37.pdf