TOPIC: To study various factors on which the internal resistance /
EMF of a cell depends.
NAME: SOUMALYA SINHA ROY
MANISHA INTERNATIONAL
SCHOOL
SCHOOL CODE: 15660
G.T ROAD, RAHUL
FOUNDATION CAMPUS,
RAJBANDH, DURGAPUR
WEST BENGAL 713212
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2022/2023
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TOPIC: To study various factors on which the internal resistance / EMF of a cell depends. NAME: SOUMALYA SINHA ROY
MANISHA INTERNATIONAL
SCHOOL
SCHOOL CODE: 15660 G.T ROAD, RAHUL FOUNDATION CAMPUS, RAJBANDH, DURGAPUR WEST BENGAL 713212
CLASS: XII
BOARD ROLL NO:
SECTION: E
CERTIFICATE
This is to certify that SURJAYAN
BHATTACHARYYA student of class XII-E
has successfully completed his project on
“Studying various factors on which the
internal resistance / EMF of a cell
depends” under the guidance of Mr.
Subhankar Das.
INDEX
● Introduction ● Aim ● Materials required ● Procedure ● Conclusion ● Precautions ● Sources of error ●Bibliography
AIM:
To study various factors on which the EMF/Internal resistance of a cell depends.
Materials Required: Potentiometer, battery, three one ways keys, a rheostat of low resistance, a galvanometer, a high resistance box, a fractional resistance box, an ammeter, a voltmeter, a voltaic cell , electrolytes of different of concentrations, a jockey, connecting wires and sand paper.
Conclusion:
- Internal resistance of a cell increases with increase in distance between the electrodes.
- Internal resistance increases with decrease in common area of the electrodes immersed in the electrolyte.
- Internal resistance increases with decrease in concentration of the electrolyte.
Precautions:
- Ensure that the emf of the battery E is greater than emf of the cell e.
- Positive terminals of E and e both should be connected at the terminal A of the potentiometer.
- The current should not be passed for a long time to avoid any heating of the wires resulting in the change of resistance.
- The length of the wire should always be measured from the end A of the wire, where all the positive terminals are connected.
- Jockey should not be pressed too hard on the wire, otherwise the diameter of the wire may not remain uniform. Also do not press the jockey on the wire while sliding it.
Bibliography: 1.NCERT Book 2.Lab Manual