(11-04-2017, 02:16 PM)jaseela123 Wrote:

Internal resistance of a cell: The opposition offered by the electrolyte of the cell to the flow of electric current through it is called internal resistance of the cell.


Factors affecting the internal resistance of a cell:

I) The greater the separation between the electrodes of the cell, the longer the electrolyte through which the current has to flow and consequently a higher value of the internal resistance

Ii) The higher the conductivity of the electrolyte, the lower the internal resistance of the cell. That is, the internal resistance depends on the nature of the electrolyte.

Iii) The internal resistance of a cell is inversely proportional to the common area of the electrodes that immerse in the electrolyte.

Iv) The internal resistance of a cell depends on the nature of the electrodes. RE rI IE  = V + v= IR + Ir= I (R + r) I = E / (R + r)  .This relationship is called the circuit equation. V