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Cell,emf, terminal potential difference,internal resistance of the cell

 Physics 

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Basic Bhysics

Cell » Cell is a device which provide necessary potential difference to an electric circuit to maintain a continuous flow of current in it .
or
it is a source of energy that maintains a continuous flow of charge in a circuit Electric cell change chemical energy into electrical energy.

EMF ( electromotive force) of a cell »
EMF of a cell may be defined as the potential difference between its terminal i.e when circuit is open.
Or
The work done  by cell in moving unit positive charge through the whole circuit (include the cell ) is called EMF of the cell .
EMF = work/charge
Emf=w/q

SI unit – volt ( J/s)

Terminal potential difference:-
The potential drop across the terminals of a cell when current is being drawn from it is called terminal potential difference (closed circuit).

It is denoted by – 'V'
SI unit – volt

Internal resistance of a cell:-
The resistance offered by the electrolyte of cell to the flow of current between the electrode is called internal resistance of a cell
It is denoted by – ' r'
SI unit – ohm



★Internal resistance of a cell depends upon following factors :-
» Nature of electrolyte.
» Directly proportional to concentration of the electrolyte.
» Directly proportional to the separation distance between the two electrolytes.
» Inversely proportional to the area of the plate dipped into the electrolyte.
»It is increase with the decrease in  the temperature of electrolyte.




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