Q.

How can an electrochemical cell be converted into an electrolytic cell

1 Reversing the flow of ions in salt bridge.  
2 Applying an external opposite potential greater than Ecell0.  
3 Exchanging the electrodes at anode and cathode.  
4 Applying an external opposite potential lower than Ecell0.  

Ans.

(2)

When in an electrochemical cell, external voltage greater than Ecell is applied, then direction of flow of charge is reversed. Now external source supplies energy to the cell and cell is now electrolytic cell.