It is precise and error-free since it draws no current from the cell.It is used to investigate the influence of ageing on cell performance as well as to troubleshoot issues with cell-powered products.This experiment validates the design of electrical circuits, the selection of appropriate power sources, and the optimization of battery performance.

POTENTIOMETER

• AB –    Potentiometer
• Bt  –    Battery Eliminator (3 amps)
• K   –    One way plug key (in  the primary circuit) 
• K   –    One way plug key (in the secondary circuit)
• Rh-     Rheostat
• L   –    Leclanche cell
• HR-    High resistance
• G  –    Galvanometer
• R  –    Resistance box
• J   –    Pencil jockey positions    

POTENTIOMETER EXPERIMENT-SIMPLE CIRCUIT DIAGRAM

POTENTIOMETER-EXPERIMENTAL SET UP

POTENTIOMETER INTERNAL RESISTANCE OF A CELL-FORMULA

POTENTIOMETER INTERNAL RESISTANCE OF A CELL-PROCEDURE

• The circuit associations and the test set up are made as displayed previously.
• In the open circuit, when resistance is excluded (not included), the emf of the cell is determined by taking note of the balancing length.That is l1
• In the shut(closed) circuit, when the resistance is incorporated the balancing length is to be noted. That is l2
• The trial is rehashed for various values of R and the readings are organized.
• Utilizing the equation the internal resistance of the given cell can be determined.

POTENTIOMETER INTERNAL RESISTANCE OF A CELL -TABULAR COLUMN &

OBSERVATION

POTENTIOMETER INTERNAL RESISTANCE OF A CELL- CALCULATION

RESULT

The internal resistance of the given Leclanche cell is 7.16 Ohms

CONCLUSION

Physics practicals can be a valuable experience for students to learn concepts, develop important skills, develop problem-solving skills, develop experimental skills such as data collection, analysis, and interpretation, and develop communication skills, which can help them identify and correct errors in their work.

Practicals help students acquire the collaborative skills required for success in the sector.The experiment, internal resistance of a cell using a potentiometer, gives fundamental insights into cell activity and properties.This experiment’s simplicity makes it accessible to both students and academics.