Find an expression for an internal resistance of a cell.
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The relationship between internal resistance (r) and emf (e) of cell s given by.
e = I (r + R)
Where, e = EMF i.e. electromotive force (Volts), I = current (A), R = Load resistance, and r is the internal resistance of cell measured in ohms.
On rearranging the above equation we get;
e = IR + Ir or, e = V + Ir
In the above equation, V is the potential difference (terminal) across the cell when the current (I) is flowing through the circuit.
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