Podcast
Questions and Answers
What is the SI unit of internal resistance?
What is the SI unit of internal resistance?
- Ohm (correct)
- Ampere
- Volt
- Farad
How does the internal resistance of a cell change with the distance between the electrodes?
How does the internal resistance of a cell change with the distance between the electrodes?
- Decreases
- Becomes zero
- Stays the same
- Increases (correct)
In the formula for internal resistance (r=[E-V]/I), what does 'V' represent?
In the formula for internal resistance (r=[E-V]/I), what does 'V' represent?
- Voltage drop across the external resistance
- Voltage of the electrolyte
- Voltage source
- Voltage across the internal resistance (correct)
How does the internal resistance of a cell change with the facing surface area of the electrodes in electrolyte?
How does the internal resistance of a cell change with the facing surface area of the electrodes in electrolyte?
What is the formula for calculating the internal resistance of a cell?
What is the formula for calculating the internal resistance of a cell?
In the experiment, why is it important to ensure that the e.m.f. of the battery is greater than that of the cell?
In the experiment, why is it important to ensure that the e.m.f. of the battery is greater than that of the cell?
What is one way to vary the internal resistance with distance of separation in the experiment?
What is one way to vary the internal resistance with distance of separation in the experiment?
How can one study the variation of internal resistance with the area of electrodes?
How can one study the variation of internal resistance with the area of electrodes?
Which factor does the internal resistance of a cell not depend on?
Which factor does the internal resistance of a cell not depend on?
Why is it important to measure the balancing length accurately using a set square?
Why is it important to measure the balancing length accurately using a set square?
How does the internal resistance of a cell change with the distance between the electrodes?
How does the internal resistance of a cell change with the distance between the electrodes?
Which factor affects the internal resistance of a cell inversely?
Which factor affects the internal resistance of a cell inversely?
What happens to the internal resistance of a cell as the temperature of the electrolyte increases?
What happens to the internal resistance of a cell as the temperature of the electrolyte increases?
How does the internal resistance of a cell change with an increase in facing surface area of the electrodes in electrolyte?
How does the internal resistance of a cell change with an increase in facing surface area of the electrodes in electrolyte?
What effect does decreasing the distance between the electrodes have on the internal resistance of a cell?
What effect does decreasing the distance between the electrodes have on the internal resistance of a cell?
How does increasing the temperature of the electrolyte affect the internal resistance of a cell?
How does increasing the temperature of the electrolyte affect the internal resistance of a cell?
When conducting an experiment to study internal resistance with distance of separation, why is it important to remove the plugs of keys K1 and K2 before proceeding?
When conducting an experiment to study internal resistance with distance of separation, why is it important to remove the plugs of keys K1 and K2 before proceeding?
What is the purpose of repeating steps 7 to 10 with different electrode separations in the experiment?
What is the purpose of repeating steps 7 to 10 with different electrode separations in the experiment?
How does varying the area of electrodes in electrolyte affect the internal resistance of a cell?
How does varying the area of electrodes in electrolyte affect the internal resistance of a cell?
In what way does increasing the temperature of electrolyte impact the accuracy of measuring internal resistance?
In what way does increasing the temperature of electrolyte impact the accuracy of measuring internal resistance?
Study Notes
Internal Resistance of a Cell
- The SI unit of internal resistance is ohms (Ω).
- Internal resistance of a cell decreases with an increase in the distance between the electrodes.
Effect of Electrode Surface Area
- The internal resistance of a cell decreases with an increase in the facing surface area of the electrodes in electrolyte.
Formula for Internal Resistance
- The formula for calculating the internal resistance of a cell is r = (E - V) / I, where 'V' represents the potential difference across the cell.
Experiment Guidelines
- It is important to ensure the e.m.f. of the battery is greater than that of the cell to ensure accurate measurements.
- To vary the internal resistance with distance of separation, one can move the electrodes closer together or farther apart.
- Repeating steps 7 to 10 with different electrode separations helps to study the variation of internal resistance with distance.
- Removing the plugs of keys K1 and K2 before proceeding is important to ensure accurate measurements.
Factors Affecting Internal Resistance
- Internal resistance of a cell decreases with an increase in the temperature of the electrolyte.
- Internal resistance of a cell decreases with an increase in the facing surface area of the electrodes in electrolyte.
- The internal resistance of a cell does not depend on the material of the electrodes.
Measurement Techniques
- Measuring the balancing length accurately using a set square is crucial to ensure accurate internal resistance measurements.
- Increasing the temperature of the electrolyte can affect the accuracy of measuring internal resistance.
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Description
Learn about the practical analysis of factors affecting the internal resistance of a cell. Discover how decreasing the internal resistance can increase the potential difference across the cell, making it more reliable.
