Q. 19

# Draw a circuit fo

The circuit to determine the internal resistance of a cell using a potentiometer of is shown below: -

The potentiometer is a device used to measure the internal resistance of a cell and is used to compare the e.m.f of two cells and potential difference across a resistor. The relation between potential difference, emf, and internal resistance of a cell is given by

Here, the V=IR;

So we can write the above equation as;

The above equation reflects that the potential drop V is less than E by the amount of fall in potential inside the cell due to internal resistance.

From the above equation,

The internal resistance of the cell is given as;

where r is the internal resistance of the cell and R is the resistance for the potentiometer.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

A carrier wPhysics - Board Papers

Name the essentiaPhysics - Board Papers

Define the term ‘Physics - Board Papers

An audio signal iPhysics - Exemplar

(i) Draw the plotPhysics - Exemplar

Compute the LC prPhysics - Exemplar

(i) Draw a block Physics - Exemplar

The maximum ampliPhysics - Exemplar

An amplitude moduPhysics - Exemplar