how do you draw a calomel electrode. Does it require two or one cells?
A calomel electrode is two electrodes in one case and serves as a standard electrode. Another electrode is required to make a complete cell. Here is a site that explains the SCE and gives a diagram. You need to scroll through the first part to get to the SCE.
http://www.everyscience.com/Chemistry/Inorganic/Redox_Reactions/b.1227.php