Download Experiment Name Student Name:Sajedah AlMarzouq ID# 20700199

Experiment Name
Student Name:Sajedah AlMarzouq
ID# 20700199
Section: 213
Submission date: 1/2/2013
PHYS 1411: Introductory Physics Lab
Lab Instructor: Nouf Al-Jalaud
Prince Mohammad Bin Fahd University
Fall 2012-2013
1. Abstract (Objective) 0.5 point
Ohm’s law is used in electrical engineering to calculate the relationship
between current, voltage and resident. We need this experiment in every day
life such as light bulls and electronic stoves. So, we have to verify that Ohm's
law is satisfied for three different resistors. The purpose of this experiment is
to understand Ohm's Law.
2. Theory 0.5 point
A current I flows through an object when an electric potential difference V is
placed across the object.
Mathematically this law is expressed as:
V = I R or
Where:
V = Voltage (the potential difference between two points which include a
resistance).
I = Current flowing through the resistance.
R = Resistance
Series
Rs= R1+R2
Parallel
2
3. Method




First try to find R1
Find R2
Find the Series resistance by using the specific draw and formula
Find the parallel resistance by using the specific draw with special sign
and formula.
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4. Data
 Parallel resistance
Draw the parallel after we find R1 & R2
 Draw the circuit diagram as shown above.
 Arrange the apparatus as per the circuit diagram.
 Make the connections as per circuit diagram. All connections must
be neat and tight. Take care to connect the ammeter and voltmeter
with their correct polarity.) + and –
 Adjust the rheostat to get a small deflection in ammeter and
voltmeter.
 Record the readings of the ammeter and voltmeter
T
1
2
3
Voltage
0.352
0.364
0.374
Current
0.031
0.032
0.034
11.3
11.375
11.
Total =33.675
R1=11
R2=5.8
R1xR2 \ R1+ R2 = 16.8
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
Series resistance
 Draw the circuit diagram as shown above.
 Arrange the apparatus as per the circuit diagram.
 Make the connections as per circuit diagram. All connections must
be neat and tight. Take care to connect the ammeter and voltmeter
with their correct polarity.) + and –
 Adjust the rheostat to get a small deflection in ammeter and
voltmeter.
 Record the readings of the ammeter and voltmeter
T
1
2
3
Voltage
0.553
0.621
0.631
Current
0.026
0.029
0.631
21.2
21.4
1
Total= 43.6
R1= 18
R2=25
R1+R2 =43
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5. Data Analysis
Overall, both parts of this lab demonstrated the relationship outlined by Ohm’s
Law and fostered a higher comprehension of the mechanisms driving circuit
behavior. The direct relationships between voltage, current, and resistance
allow measurement of the voltage and current without resistance being
known. Additionally, the ability to manipulate voltage allowed the experiment
to contain a sense of systematic collection of data to provide a contextual
experimental example of the relationships in Ohm’s law. Moreover, the
experiment also demonstrated how the different configurations of resistors,
parallel or in a series could play a role in the behavior of the circuit and its
components. In conclusion, this lab effectively helped grant a higher
understanding of how circuits are governed by Ohm’s law.
6. Conclusion
The value of voltage range in circuit will be liner with the value of resistor
chosen and perpendicular with the value of current resulted
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