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Mayank Verma from KENDRIYA VIDYALAYA NO 2, asked a question
Subject: Physics , asked on 29/12/11

On what factors the internal resistence of a cell depends ?

EXPERT ANSWER

Pallabi Chakraborty , Meritnation Expert added an answer, on 30/12/11

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.

Consider the following figure:

E  = V + v

= IR + Ir

= I (R + r)

I = E / (R + r) 

This relation is called circuit equation

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Sr From Delhi Public School, added an answer, on 30/12/11
27 helpful votes in Physics

 The internal resistance (r) of a cell depends on the following factors :

a) separation between the two plates,d (r is directly proportional to d).

b) Area of the plates dipped in the electrolyte,A ( inversely varies with A ).

c) Nature of the concentration of the  electrolyte.

d) Temperature ,T(inversely varies with T).

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Sanjeev A.r From Kendriya Vidyalaya, added an answer, on 30/12/11
128 helpful votes in Physics
  •  if your question is referring to potentiometer then the internal resistance is given by
  • r=R{l1/l2-1}
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Mayank Verma From Kendriya Vidyalaya No 2, added an answer, on 31/12/11
1 helpful votes in Physics

how internal rasistance is inversely propotional to the tempreture. can u please explain it  in more details?

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Mayank Verma From Kendriya Vidyalaya No 2, added an answer, on 31/12/11
1 helpful votes in Physics

explain 3rd limitation?

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