Factors Affecting Internal Resistance of a Cell Quiz and Flashcards

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

Decreases

Becomes zero

Stays the same

Increases (correct)

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?

Decreases Signup and view all the answers

What is the formula for calculating the internal resistance of a cell?

r = (E-V)/R Signup and view all the answers

In the experiment, why is it important to ensure that the e.m.f. of the battery is greater than that of the cell?

To ensure a null or balance point can be obtained Signup and view all the answers

What is one way to vary the internal resistance with distance of separation in the experiment?

Keep both electrodes at different distances Signup and view all the answers

How can one study the variation of internal resistance with the area of electrodes?

Increase the area of electrodes by dipping them at different depths in electrolyte Signup and view all the answers

Which factor does the internal resistance of a cell not depend on?

Temperature Signup and view all the answers

Why is it important to measure the balancing length accurately using a set square?

To ensure precise readings are recorded Signup and view all the answers

How does the internal resistance of a cell change with the distance between the electrodes?

It decreases as the distance increases Signup and view all the answers

Which factor affects the internal resistance of a cell inversely?

Facing surface area of the electrodes Signup and view all the answers

What happens to the internal resistance of a cell as the temperature of the electrolyte increases?

It increases Signup and view all the answers

How does the internal resistance of a cell change with an increase in facing surface area of the electrodes in electrolyte?

It decreases Signup and view all the answers

What effect does decreasing the distance between the electrodes have on the internal resistance of a cell?

Decreases the internal resistance Signup and view all the answers

How does increasing the temperature of the electrolyte affect the internal resistance of a cell?

Increases the internal resistance Signup and view all the answers

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?

To prevent short circuits Signup and view all the answers

What is the purpose of repeating steps 7 to 10 with different electrode separations in the experiment?

To determine the effect of electrode distance on internal resistance Signup and view all the answers

How does varying the area of electrodes in electrolyte affect the internal resistance of a cell?

Has no effect on the internal resistance Signup and view all the answers

In what way does increasing the temperature of electrolyte impact the accuracy of measuring internal resistance?

Causes errors in measurement Signup and view all the answers

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.