Question

on which factor does the emf of a cell depends

Answer 1

Internal Resistance of a cell:The opposition offered by the electrolyte of the cell to the flow of electric current through it is called the internal resistance of the cell. Factors affecting Internal Resistance of a cell: i) Larger the separation between the electrodes of the cell, more the length of the electrolyte through which current has to flow and consequently a higher value of internal resistance ii) Greater the conductivity of the electrolyte, lesser is the internal resistance of the cell. i.e. 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 dipping 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 relation is called circuit equation. V

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Answer 2

the material of the electrodes

the electrolytes used in a cell