Question

on what factors does the internal resistance of a cell depends upon and why ?

Answer 1

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.

Answer 2

The internal resistance of a cell depends on the temperature and concentration of electrolytes, the surface area of the electrodes and the distance between the electrodes of the cell.

Explanation

• Internal resistance decreases as temperature increases because more charge carriers are available.
• If the concentration is higher, internal resistance is higher.
• More distance between the electrodes causes more internal resistance.
• The surface area of electrodes that are dipped into the electrolytes is more; the internal resistance is more, in fact, the internal resistance is proportional to the area of the electrodes.

#SPJ2