The meaning and significance of uncompensated resistance are carefully expl
ained. Many factors influence the uncompensated resistance and several of t
hese are explored in this article, using idealized models of an electrochem
ical cell. Among the factors whose roles have been elucidated are the shape
and size of the cell, the location of the reference electrode, the shape o
f the working electrode, and the size and position of the counter electrode
. Worthwhile compensation is shown to be impossible with microelectrodes.