Question

If I is the current in the external resistor R and r is the internal resistance of the cell, the equation for the whole circuit is:

            E = I(R + r)          …….(i)

            For the same current in the external resistor R, the terminal voltage is given by:

            V = IR                  …….(ii)                                                                

                                                                                               

     Use equations (i) and (ii) to solve for r by eliminating I and write this equation the form:   y = mx + b Identify the dependent and independent variable

So I made an equation in the form y=mx+b which is r=E*(R/V)-R from the two equations above. If this is right I am unsure of how to graph this equation so that I can find the slope which will be equal to r. I have a table of values of V and R so what values would go on my x axis and what values would go on my y axis? Thanks

Answer 1