In an experiment to investigate the variation of current I with potential difference V for a copper sulfate solution, the following apparatus was used - Leaving Cert Physics - Question 4 - 2012
Question 4
In an experiment to investigate the variation of current I with potential difference V for a copper sulfate solution, the following apparatus was used.
(i) Name the... show full transcript
Worked Solution & Example Answer:In an experiment to investigate the variation of current I with potential difference V for a copper sulfate solution, the following apparatus was used - Leaving Cert Physics - Question 4 - 2012
Step 1
Name the instrument X.
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Answer
The instrument X is a milliameter, which is used for measuring small electric currents.
Step 2
Name the apparatus Y and give its function in the experiment.
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The apparatus Y is a potentiometer. Its function in the experiment is to measure the potential difference (voltage) across the copper sulfate solution, ensuring that the current remains constant.
Step 3
How was the potential difference measured in the experiment?
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The potential difference was measured using a voltmeter connected in parallel to the copper sulfate solution to accurately determine the voltage across it.
Step 4
Using the data in the table, draw a graph on graph paper to show the variation of current with potential difference.
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To plot the graph, label the x-axis as '1/I (A)' and the y-axis as 'V (V)'. Plot the points based on the values from the table. Connect the points using a straight line to show the linear relationship between current and potential difference.
Step 5
Calculate the slope of your graph.
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To calculate the slope of the graph, use the formula:
Use this value to determine the resistance of the copper sulfate solution.
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Using Ohm's Law, which states that resistance R is equal to the potential difference V divided by the current I, we can calculate the resistance of the copper sulfate solution:
R = rac{V}{I} = rac{5.0}{2.0} = 2.5 ext{ ohms}
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