Question

Draw the shape of the graph showing the variation of terminal voltage V of the cell as a function of current I drawn from it. How one can determine the e.m.f. of the cell and its internal resistance from this graph?

Answer 1

The graph shows the variation of terminal voltage V with current I.

The y-intercept of the graph gives the emf (E) of the cell.

The slope of the graph (−r) gives the internal resistance (r) of the cell.