q3 internal resistance

Question

A cell has a terminal voltage of 1.9V when supplying a load with a current of 8A. When the load is disconnected, the terminal voltage rises to 2.03V. Calculate the internal resistance of the cell.

Answer 1

Step 1:

The terminal voltage  is and current I is .

When the load is disconnected, the terminal voltage rises to  is .

Then the potential difference  is .

Here current is constant, because cell is connected in series.

So

The internal resistance of the cell is .

Solution :

The internal resistance of the cell is .