Example

Let's consider a standard three-electrode setup. The ohmic drop between WE-Ref and Ref-CE is not the same, which can be the observed if the CE is located away from the Ref.

Look at how the cell voltage is adjusted by the potentiostat to apply the desired voltage.

WE
Ref
CE

0V
3V
10V

In order to apply 3V between WE and Ref, the potentiostat should be able to apply 10V between WE and CE !