CBSE Class 12-science Answered
what are the formula in finding internal resistance in potentiometer
Asked by anu Mishra | 25 Jan, 2016, 06:20: PM
Expert Answer
Hi,
If a cell of emf E and internal resistance r, connected to an external resistance R, then the circuit has the total resistance (R+r). The current I in the circuit is given by,
This means, V is less than E by an amount equal to the fall of potential inside the cell due to its internal resistance.
From the above equation,
Using a potentiometer, we can adjust the rheostat to obtain the balancing lengths l1 and l2 of the potentiometer for open and closed circuits respectively.
Then, E= k l1 and V = k l2 ; where k is the potential gradient along the wire.
Now we can modify the equation for getting the internal resistance of the given cell, by using the above relations as;
Answered by | 25 Jan, 2016, 06:25: PM
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