If I is the current in the external resistor R and r is the internal resistance

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 and write this equation the form:
y = mx + b
Identify the independent variable and the dependent variable

Explanation / Answer

E = I(R + r) ---> E = IR + r since V = IR E = V + r ---> E =1*r+V compare with y=mx+b then, m =1, b =B , y= E , x=r here, r,V are independent variables, and E is dependent variable

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