Why does the electrochemical cell stop working after some time ?

Explanation

The electorde potential of any electrode depends upon the concentration of ions with time as the cell operates the concentration of the metal ions (e.g `Zn^(2+))` ions in the anodic compartment increases and hence electrode potential of anode also increases at the same time the concentration o fmetal ions (e.g `Cu^(2+))` ions decreases in the cathodic compartment and hence electode potential of hte cathode also decreases ultimately the elctrode potentials of the two elctrodes beocmes equal at this stage the cell stope working since `E_("cell")` (which is equal ot the diffeernce of the electorde potential of the cathode and anode becomes zero