Ohms' law
This lab report example demonstrates Ohm’s Law using a virtual experiment to explore how voltage affects current flow through a circuit. The experiment confirms that as voltage increases, so does the current, given a constant resistance. The findings are graphed to visually represent the direct proportionality between voltage and current, providing a clear example of this fundamental physics principle.
September 17, 2024
* The sample essays are for browsing purposes only and are not to be submitted as original work to avoid issues with plagiarism.
Surname 1
Student's Name
Professor
Course
Date
Ohms' Law
Introduction
Ohms law states that current flowing through the circuit is directly proportional to voltage,
given that resistance will be controlled (Britannica). The law can be summarised using the
following formula;
Where;
V= the potential difference/voltage across the circuit
I= current flow
R= resistance
According to Ohms' law, the voltage and the current flowing through the circuit also
increases. On the other hand, as the resistance increases, the current reduces, and thus current
and resistance have an inverse relationship (Britannica).
A graph of voltage (V) against the current (I) will have a positive trend line where the
gradient of the graph will represent resistance (R).
Materials
V=IR
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The experiment will be virtual, and thus, the following materials will be required;
-Web browser
PHET simulator (https://phet.colorado.edu/en/simulation/circuit-construction-kit-dc-virtual-
lab)
Procedure
1. Launch the PHET simulator using the link given below; https://phet.colorado.edu/en/
simulation/circuit-construction-kit-dc-virtual-lab
2. Arrange the simulation as shown by the image below; (note that resistance will be
kept constant at 10 ohms in the entire experiment)
3. Set the voltage to 9 volts using the slider at the bottom of the window. Record the
current readings (Ampere) as shown by the ammeter.
4. Repeat steps 3-4 two more times, recording the ammeter readings.
5. Adjust the voltage to 12V, record the ammeter readings, and repeat the process twice.
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6. Set the voltage to 14V, 20 V, 23 V, 34V, and 41 V while recording the ammeter
readings
7. Repeat step 6 two more times to ensure data accuracy.
8. Find the average current (A) based on the recorded data.
9. Plot a graph of voltage (V) against the current (I)
Data
Sample Calculations
Average current (I)
Voltage (V)
Current (A)
Trial 1
Trial 2
Trial 3
9.0
0.9
0.9
0.9
12.0
1.2
1.2
1.2
14.0
1.4
1.4
1.4
20.0
2.0
2.0
2.0
23.0
2.3
2.3
2.3
34.0
3.4
3.4
3.4
41.0
4.1
4.1
4.1
Averagecurrent(I)=Trial1 + Trial1 + Trial1
3
Averagecurrent(I)(9V)=0.9 + 0.9 + 0.9
3= 0.9A
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I used the same method to compute the average current for other trials, as shown by the
processed data in table 2 below;
From table 1 above, it can be noted that as the voltage rises, current also increases. The data
in table 2 can be plotted as shown below;
Voltage
(V)
Current
(I)
9.0
0.9
12.0
1.2
14.0
1.4
20.0
2.0
23.0
2.3
34.0
3.4
41.0
4.1
52.0
5.2
Voltage (V) vs Current (I)
Voltage (V)
0
15
30
45
60
Current (I)
0
1,5
3
4,5
6
y = 10x
R² = 1
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As the voltage increases, the current flowing through the circuit also increases. When the
voltage is 9 volts, the ammeter reading is 0.9 A. When the voltage is 52.0 volts, the ammeter
reading is 5.2 A. The slope of the above graph is 10, equivalent to the resistance (10 ohms).
Mathematically the slope of the graph can be written as;
Based on the equation above, the slope of the graph is equivalent to resistance (R); thus, the
resistance of the above circuit is 10 ohms. The hypothetical resistance is equivalent to the real
value and thus confirms Ohm's law.
Conclusion
Ohms law states that voltage (V) is directly proportional to current (I), given that resistance is
kept constant. From this experiment, as the voltage increases, the current flow also increases
and thus confirming the Ohms law. The slope of the graph ( is equivalent to the resistance
used in this exploration.
Slope =V
I=R
V
I)
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Works Cited
Britannica. "Ohm's Law | Physics." Encyclopædia Britannica, 14 Dec. 2018,
www.britannica.com/science/Ohms-law.
September 17, 2024
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Academic level:
Undergraduate 1-2
Type of paper:
Lab report
Discipline:
Physics
Citation:
MLA
Pages:
4 (1100 words)
* The sample essays are for browsing purposes only and are not to be submitted as original work to avoid issues with plagiarism.
