Using a potentiometer how do you determine the internal resistance of a cell?

Potentiometer is used to determine the internal resistance of a cell using potentlometer:- A potentiometer is a device for ________.

With the help of a circuit diagram describe the method to find the internal resistance of a cell using potentiometer.

A long resistance wire is stretched between two iron nails. A battery of 2V is applied across the wire. One end of a torch bulb is connected to nail and other end is made in contact as shown in figure. - How this principle is used to determine internal resistance of cell

A cell consists of electrodes and electrolyte. When it is connected to an external circuit it sends a current through it. What is meant by internal resistance of a cell?

How do you explain the functionality of a monomer?