ANSWER
The purpose of the power source is to continually supply current to the cell so that, the electrolyte can dissociate to form more ions.
Step-by-step explanation
From the figure given, you will see that the cell is connected to a power to a power source. The power source is a battery.
The cell contains electrodes and an electrolyte
An electrode is an electrical conductor used to make a contact with a nonmetallic part of a circuit.
An electrolyte is a substance that conducts electricity when dissolved in water.
The purpose of the power source is to continually supply current to the cell so that, the electrolyte can dissociate to form more ions. The ions produced are responsible for the conductor of electricity