Testing Ohm | EssayIvy.com

Testing Ohm

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Student’s Name
Instructor
Course
Date
Testing Ohm’s Law Lab Report
Ohm's law is a principle that relates the voltage, current and resistance in one equation
(V=IR). It states that voltage, which is the driving force, is directly proportional to the current
provided resistance remains constant. It is a fundamental law that finds use in every electrical
and electronic application. For instance, in selection of fuses, design of electronics, power supply
systems, speed control, and heaters and many more. Therefore, it is paramount to understand the
Ohm's law and testing its validity forms the focus of this experiment.
Objectives
Experimentally show the validity of Ohm's law is the core purpose of this study. The
experiment objective is to answer the following questions: When the potential difference
(voltage) across a resistor is raised, how does the current through the resistor vary? How does
this relationship behave for different resistors?
Thesis Statement
When the voltage across the resistance is increased, then there will be a corresponding
increase in current along the circuit.
Experiment Design
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Apparatus
Breadboard
Digital multimeter
Jumpers
Resistors
Variable DC supply
Potentiometer
Procedure
The experiment was conducted as per the guidelines of the lab manual with all the
precautions taken into account. The circuit arrangement is a shown in figure 1.
Figure 1: The circuit arrangement of the experiment.
Results
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The readings of both volts and current at a constant resistance of 10 Ω from the
experiment were recorded in the table below.
Power supply
Volts (V)
Current (A)
0
0
0
2
2.1
0.21
4
4.0
0.36
6
5.5
0.5
8
7.6
0.67
10
9.4
0.8
12
11.3
1.1
Table 1: shows the results recorded while experimenting.
Graph 1: shows the relationship between voltage and current
Discussion
0
0.2
0.4
0.6
0.8
1
1.2
0 2.1 4 5.5 7.6 9.4 11.3
Current (A)
Voltage (V)
Voltage against Current
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The results indicate that at open circuit both the ammeter and voltmeter reading were
zero. This response is correct since at open circuit there is no potential difference between the
ends and hence no current flow. Upon connecting the power source with a voltage of 2V, the
ammeter deflected to read 0.21A. On increasing the volts to 4V maintaining the resistance, the
reading also increased to 0.36A. Same outcome is evidenced on repeating the experiment with
different values of voltage. The graph plotted shows a linear relationship between voltage and
current at a constant resistance. Repeating the experiment using different resistors only changed
the values but the trend remains the same.
Conclusion
A change in the voltage at a constant resistance results in a corresponding change in the
current flowing in the circuit. The outcome of the experiments confirms the hypothesis of the
relationship that exists between voltage and current. However, there were some errors while
collecting data attributed to instruments calibration making the graph not linearly perfect.
Nevertheless, the outcome of the experiment confirms the validity of Ohm's law.

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