Saturday, 13 August 2016

electric circuits - Relation between Terminal Voltage and EMF of a cell while the cell is being charged


I know the relation between the terminal voltage, V and emf of the cell, V' while charging given by


V = V' + Ir


where I = Current in the circuit and r = Internal Resistance of Cell


Can anyone please explain why in charging a cell, the sign changes from - (which is when the cell discharges) to + in detail by deriving the formula ?


Thanx in advance





@Farcher Can u explain/deduce that formula(V = V' + Ir) on the basis of following diagram:-


enter image description here


The diagram shows a cell of emf, V' and internal resistance, r being charged up by a charger.




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