Constant current coulometry:

In constant current coulometry, a current is managed constant till the completion of the analytical reaction that could be detected through a visual indicator solution or through potentiometric or spectrophotometric methods. The quantity of electricity needed to attain the end point is derived from the amount of coulombs consumed.

Primary constant current coulometry:

In this method, the element to be estimated undergoes direct reaction at the electrode along with 100 percent effectiveness.