Potentiometer Experiment: Comparing EMF of Two Cells | Practical Insights

INTRODUCTION

Potentiometers are extremely precise equipment for detecting potential differences or emf.The experiment ‘potentiometer,comparison of emf of two cells’ is a basic experiment that students do using their fundamental physics skills.Students see how emf is measured and how emf is related to the potential difference across a wire in this experiment.

This experiment aids in the comprehension of the idea of emf and how it relates to the electrochemical characteristics of cells. This experiment refers to tactical applications like selecting the best battery for a certain device or evaluating the performance of various energy sources.

CIRCUIT DIAGRAM -POTENTIOMETER EXPERIMENT

POTENTIOMETER EXPERIMENT- CONDITION FOR EMF OF PRIMARY CIRCUIT

SIMPLE CIRCUIT DIAGRAM -POTENTIOMETER EXPERIMENT

DOUBLE POLE DOUBLE THROW SWITCH CONNECTIONS

POTENTIOMETER EXPERIMENT-POTENTIAL GRADIENT

For better results ,use freshly prepared cell otherwise, the polarisation effect will occur which is isolating barriers develop an interface between electrode and electrolyte.

The sensitivity of the potentiometer depends on a potential gradient (K). If the potential gradient is small  then the potentiometer is said to be more correct and sensitive. 

EXPERIMENTAL SETUP-POTENTIOMETER EXPERIMENT

POTENTIOMETER EXERIMENT-COMPARISON OF EMF-PROCEDURE

1. This is the simplest circuit and all the connections are made as shown above. Connect the positive terminals of the auxiliary battery and primary cells to point A of the potentiometer (zero point).

2. To check the correctness of the circuit, the pencil jockey is pressed near the end A and B of the potentiometer.

If  the galvanometer shows two side deflections, then the circuit is correct, otherwise again check the circuit connections.              

• After confirming the double side deflections, the rheostat is adjusted at different positions.

• For each adjustment of the rheostat the corresponding balancing lengths (null deflection) for the two cells on the potentiometer wire are taken separately.

• The observed readings are to be entered in the tabular column

TABULAR COLUMN – POTENTIOMETER EXPERIMENT

POTENTIOMETER EXPERIMENT-CALCULATIONS & RESULT

POTENTIOMETER EXPERIMENT-EMF VERIFICATION

CONCLUSION

Physics practicals can be a valuable experience for students to learn concepts, develop important skills, develop their problem-solving skills, have the opportunity to develop their experimental skills like data collection, analysis, and interpretation, and have the ability to develop their communication skills, which can help them find and correct errors in their work.

Practicals help pupils in developing collaborative skills, which are necessary for success in the industry. The potentiometer experiment measuring the emf of two cells is a good practical exercise in the study of electrical and electro-chemical concepts because of its accuracy, sensitivity, direct measurement, educational value, and real-world relevance.

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