.

1. FINAL REPORT OF PRACTICUM
PHYSICS II
"OHM LAW I"
COLLECTION DATE: 7th
of March 2018 M
PRACTICUM DATE: 12th
of March 2018 M
NAME : Utut Muhammad
"OHM LAW I"
FINAL PRACTICUM
A. OBJECTIVES PRACTICUM
1. to determine the relationship between voltage and the strong electric
current flowing in a wire.
2. Can know the relationship between voltage and current strength in series
and parallel circuits.
3. To know the relationship between voltmeter and amperemeter in series
and parallel circuit.
4. Can know the relationship between voltage and electric current at the
price of various resistors.
B. BASIC THEORY
To produce an electric current in a circuit. Potential difference is
needed. One way to produce potential difference is by the battery. George
Simon Ohm (1787-1854) determined by experiment that the current in metal
wires is proportional to the difference potential V given to the ends.
Exactly how much current in the wire does not only depend on the
voltage? But also on the resistance is given by the wire to the flow of
electrons. The higher the resistance, the smaller the current for a voltage V.
So, the resistance is defined as the reverse current with resistance (𝐼 =
𝑉
𝑅
),
where R is the resistance of the wire, V is the potential difference across the

2. OF THE CUTE OF UTUT PARAREL MUHAMMAD
device, and I is the current flowing to him. This relationship is often written
(𝑉 = 𝐼 𝑥 𝑅), and is known as Ohm's Law. (Giancoli, 2001: 67-68)
Based on Ohm I Law is defined as the obstacle used in the circuit
passed by the current amperage with a potential difference. The obstacle is
the ratio between the difference between the potential and the strong electric
current. So the size of the electrical resistance is not affected by the voltage
and current strength but is influenced by the length of the wire, cross-
sectional area, and type of material (Resistance). (Tripler, Paul A, 1991: 89)
Ohm's law states that the binding at the terminal is directly
proportional to the current flowing, mathematically can be formulated: 𝑉 =
𝐼𝑅, where the constant R is called resistance. The unit for resistance is Ohm,
which is (𝐼 =
𝑉
𝑅
), and is usually abbreviated as omega uppercase. (Durbin,
2005: 245)
To find the current flowing in a series with more than one prisoner,
the total value of the prisoners is needed. This is understandable because
each prisoner in the series will provide an obstacle for the current to flow.
(Hayt, 1995: 325)
From the Ohm Law equation above then sketched in the resulting
graph in the form of a straight line with a gradient showing the value R. The
material properties that show a straight curve VI curves is called Ohmic
material.
(Ishaq, 2007: 74)
Materials that adhere to Ohm's Law are caused as Ohmic material.
From experiments, it was found that not all of them have this trait. Materials
and devices that do not adhere to Ohm's Law are said to be non-Ohmic.
(Jewwet, 2010: 365)

3. OF THE CUTE OF UTUT PARAREL MUHAMMAD
Ohm's law can be applied in a series of series of detention which is
meant by a series of series resistors which are prisoners that are connected
to the end of a prisoner that is in a circuit to the end or in a chain. To look
for currents flowing in series with more than one prisoner. The total value
of the detainees is applied. (Rusdianto, 1999: 19)
Ohm's law initially consisted of two parts. The first section is the
only obstacle to formulate the equation 𝑉 = 𝐼 𝑥R.We often refer to this
equation as Ohm's Law. But Ohm's Law also says that R is a constant that
is independent of V and I. (Fredrick, 2006: 185)
C. TOOLS AND MATERIALS
NO PICTURES
NAME OF TOOLS AND
MATERIALS
1 Power Supply
2 Digital Multimeter
3 One pole switch one line
4 Connecting Cable

4. OF THE CUTE OF UTUT PARAREL MUHAMMAD
5 50 Ohm 5 watt resistor
6 5 watt 100 Ohm resistor
D. WORK STEPS
NO IMAGES WORK STEP
1 Prepare tools and materials
2
Connect the positive power
supply switch with the
connecting cable.
3
Take the connecting cable and
connect it to switch
4
Connect the resistor with the
multimeter in series to
measure the current strength
(set the multimeter 20𝜇𝐴

5. OF THE CUTE OF UTUT PARAREL MUHAMMAD
5
Parallel the cable to the
resistor to the multimeter to
check the current voltage of
20V on the multimeter
6
Connect the serial multimeter
to the power (-). Repeat steps
for resistors100𝛺 and 50Ω. As
well as alternating voltage 6V
and 3V.
E. EXPERIMENT DATA
Experiment I
Pegukuran for Resistor 50 Ω with 3 volts
No
V
(volts)
I (Ampere) R (Ohm)
1 3.26 0.06
54.33333
3
2 3.19 0.06
53.16666
7
3 3.09 0 , 06 51,5
4 3,18 0,06 53
5 3,16 0,06
52,66666
7
Average
52,93333
3
Experiment II
Measurement for Resistor 100 Ω with 3 volts
No V (volts) I (Ampere)
R (
Ohm)
1 3.28 0.03 109,333
2 3.28 0.03 109,333
3 3.26 0.03 108,667
4 3.26 0.03 108,667
5 3.28 0.03 109,333
Average 109,067

6. OF THE CUTE OF UTUT PARAREL MUHAMMAD
Experiment III
Pegukuran for Resistor 50 Ω with 6 volts
No
V
(volts)
I (Amperes) R (Ohm)
1 6.2 0.12
51.66666
7
2 6.2 0.12
51.66666
7
3 6.24 0.12 52
4 6, 23 0.12
51.91666
7
5 6.2 0.12
51.66666
7
Average
51.78333
3
Experiment III
Measurement for Resistor 50 Ω with 6 volts
No
V
(volts)
I (Ampere) R (Ohm)
1 6.28 0.06 104.667
2 6.29 0.06 104.833
3 6.24 0.06 104
4 6.23 0.06 103.833
5 6.28 0.06 104,667
Average 104.4
F. DATA PROCESSING
N
o
Resistors 50 Ω and 3 volt
N
o
Resistor 100 Ω and 3 volt
1
Dik:
V = 3.26 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.26
0.06
𝑅 = 54.333333 𝛺
1
Dik:
V = 3.28 V
I = 0.03 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.28
0.03
𝑅 = 109,333 𝛺
2
Dik:
V = 3.19 V
I = 0.06 A
Dit R?
2
Dik:
V = 3.28 V
I = 0.03 A
Dit R?

7. OF THE CUTE OF UTUT PARAREL MUHAMMAD
𝑅 =
𝑉
𝐼
=
3.19
0.06
𝑅 = 53.166667 𝛺
𝑅 =
𝑉
𝐼
=
3.28
0.03
𝑅 = 109,333 𝛺
3
Dik:
V = 3.09 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.09
0.06
𝑅 = 51.5 𝛺
3
Dik:
V = 3.26 V
I = 0.03 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.26
0.03
𝑅 = 108,667 𝛺
4
Dik:
V = 3.18 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.18
0.06
𝑅 = 53 𝛺
4
Dik:
V = 3.26 V
I = 0.03 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.26
0.03
𝑅 = 108,667 𝛺
5
Dik:
V = 3.16 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.16
0.06
𝑅 = 52.666667 𝛺
5
Dik:
V = 3.28 V
I = 0.03 A
Dit R?
𝑅 =
𝑉
𝐼
=
3.28
0.03
𝑅 = 109,333 𝛺
N
o
Resistor 50 Ω and 6 volts
N
o
Resistor 100 Ω and 6
volts
1
Dik:
V = 6.2 V
I = 0.12 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.2
0.12
𝑅 = 51.666667 𝛺
1
Dik:
V = 6.28 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.28
0.06
𝑅 = 104,667 𝛺
2
Dik:
V = 6.2 V
I = 0.12 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.2
0.12
𝑅 = 51.666667 𝛺
2
Dik:
V = 6.29 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.29
0.06
𝑅 = 104,833 𝛺
3
Dik:
V = 6.24 V
I = 0.12 A
Dit R?
3
Dik:
V = 6.29 V
I = 0.06 A
Dit R?

8. OF THE CUTE OF UTUT PARAREL MUHAMMAD
𝑅 =
𝑉
𝐼
=
6.24
0.12
𝑅 = 52 𝛺
𝑅 =
𝑉
𝐼
=
6.24
0.06
𝑅 = 104 𝛺
4
Dik:
V = 6.23 V
I = 0.12 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.23
0.12
𝑅 = 51.916667 𝛺
4
Dik:
V = 6.23 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.23
0.06
𝑅 = 103,833 𝛺
5
Dik:
V = 6.2 V
I = 0.12 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.2
0.12
𝑅 = 51.666667 𝛺
5
Dik:
V = 6.28 V
I = 0.06 A
Dit R?
𝑅 =
𝑉
𝐼
=
6.28
0.06
𝑅 = 104,667 𝛺
N
o.
𝑋 50 istor resistor and 3
volt
N
o
𝑋 Resistor 100 Ω and 3 volt
1
𝑅𝑋
=
𝑅(1 + 2 + 3 + 4 + 5)
5
𝑅𝑋
=
54.33 + 53.17 + 51.5 + 53 + 52.67
5
𝑅𝑋 =
264.67
5
𝑅𝑋 = 52.93 𝛺
1
𝑅𝑋
=
𝑅(1 + 2 + 3 + 4 + 5)
5
𝑅𝑋
=
109.33 + 109.33 + 108.67 + 108.67 + 10
5
𝑅𝑋 =
545.33
5
𝑅𝑋 = 109,067 𝛺
N
o
𝑋 Resistors 50 Ω and 6
volts
N
o
𝑋 Resistor 100 Ω and 6 volts
1
𝑅𝑋
=
𝑅(1 + 2 + 3 + 4 + 5)
5
𝑅𝑋
=
51.67 + 51.67 + 52 + 51.92 + 51.67
5
𝑅𝑋 =
258.92
5
𝑅𝑋 = 51.78 𝛺
1
𝑅𝑋
=
𝑅(1 + 2 + 3 + 4 + 5)
5
𝑅𝑋
=
104.67 + 104.83 + 104 + 103.83 + 104.6
5
𝑅𝑋 =
522
5
𝑅𝑋 = 104.4 𝐴𝑆𝐴𝑁

9. OF THE CUTE OF UTUT PARAREL MUHAMMAD
G. DISCUSSION
In this Ohm Law practice part one, it will compare the value of the
resistor used when practicing with the value of the resistor obtained from
the results of calculations with the data obtained in the form of voltage and
current strength, we can seeking or calculating the resistor by the formula
𝑅 =
𝑉
I.
Based on the experiments that have been carried out in this lab, there
are four experiments, the first experiment is measuring the voltage of 3 volts
using a 50 resistor. Obtained the results of the average resistance is 52.93
Ω. The resistor that approaches the actual resistor value is 50 Ω. To adjust
the current strength, a multimeter is used which is arranged in series, while
the voltage is arranged in parallel.
When the power supply is connected to a circuit via a connecting
cable, the current and voltage values are obtained and can be seen on the
ammeter and voltmeter, where the ammeters are arranged in series. And the
voltmeter is arranged in parallel.
Based on the sound of Ohm's Law itself which states that the amount
of electric current flowing through a conductor is always straight-line with
the potential difference that is applied to the resistance and inversely
proportional to the resistance. So the smaller the current strength, the bigger
the obstacles you get. This is in accordance with the experiments carried out
by the practitioner. Besides that, the comparison between voltage and
current is a constant number. On the calculation of the electrical resistance
obtained the value is close to constant. This happens the possibility of
obstacles found in the tool.
Why when we do an experiment when the power supply is rotated
like six voltages and the output that comes out in the millimeter is more?
Because the function of the power supply is the source of the current-voltage
when the selector is turned towards six voltages, the result will be more in
the multimeter because the voltage supply is stored, therefore when it is

10. OF THE CUTE OF UTUT PARAREL MUHAMMAD
turned towards six voltage the result will be more not far from the voltage
value.
In the next experiment using a voltage of 3 volts and a resistor of
100 Ω. The average result is 109,067 Ω. The second experiment of Ohm's
Law's value in measurement is not much different. The electrical current
produced is very small so the resistance value is large, not in accordance
with the value of the resistance that is used is 100 Ω. This happens because
of the possibility of the obstacles found in this tool.
Likewise the same as the third and fourth experiments, the data
obtained is not much different from the actual resistance value. So when
experimenting, the smaller the current is obtained, the greater the resistance,
and the greater the current it gets, the smaller the barriers, which means that
in this experiment the data obtained is in accordance with Ohm's Law.
Praktikan can run the lab until the end as well as possible with the guidance
of Ayu.
H. POST PRACTICUM TASKS
1. Make a graph of the relationship between V and me for a 50 resistor
according to the data obtained in table 1! Tell your comments/responses
to the chart!
Answer:

11. OF THE CUTE OF UTUT PARAREL MUHAMMAD
My response is: the current contained in the graph above is all the same
which is equal to 0.06 Amperes, but the voltage obtained is different,
the experiment is done five times in order to get a value that is as close
to the value. The result of the resistance is also different from each of
the voltages, but the graph does not exceed the original resistor value of
50 Ω.
2. Make a graph of the relationship between V and me for a 100 resistor
according to the data obtained in table 2! Tell your comments/responses
to the chart!
Answer:
My response is: the currents in the graph above are all equal, which is
0.03 amperes, but the voltage obtained is different, the experiment is
done five times in order to get a value that is as close to the value. The
result of the resistance is also different from each of the voltages, but
the graph does not exceed the original resistor value of 100 Ω.
3. Is there a match between the resistance values of the two actual resistors
with the calculation value!
Answer:

12. OF THE CUTE OF UTUT PARAREL MUHAMMAD
Based on the data that has been obtained is no match the resistance value
of the resistor 50 Ω at a voltage of 3 volts and 6 volts. Based on the
results of the experiments were 52.93 Ω and 51.78 Ω. The resistance
value of a resistor 100 Ω at a voltage of 3 volts and 6 volts based on the
experimental results is 109.067 Ω and 104.4 Ω.
4. What is the percentage of the value you obtained in the experiment
with the actual value of the resistance (for the two resistors used)!
Answer:
Percentage of error value in the first trial:
% 𝑒𝑟𝑟𝑜𝑟 = (
52.93 − 50
50
) 𝑥 100% = 5.86%
Percentage of error value in the second experiment:
% 𝑒𝑟𝑟𝑜𝑟 = (
109,067 − 100
100
) 𝑥 100% = 9,067%
Percentage of error value in the third experiment :
% 𝑒𝑟𝑟𝑜𝑟 = (
51.78 − 50
50
) 𝑥 100% = 3.56%
Percentage of error value in the third experiment:
% 𝑒𝑟𝑟𝑜𝑟 = (
104.4 − 100
100
) 𝑥 100% = 4.4%
5. What difference did you get in accordance with the prevailing theory
(Ohm's Law)? Express your opinion.
Answer:
The difference obtained in accordance with the prevailing theory is that
the magnitude of the resistance is directly proportional to the current
flowing and the magnitude of the voltage affects the current flowing
and does not affect the magnitude of the resistance.
I. CONCLUSION
Based on the practicum that has been done, it can be concluded that:
1. The voltage is directly proportional to the current strength, the greater
the voltage, the greater the strong current generated.

13. OF THE CUTE OF UTUT PARAREL MUHAMMAD
2. Flow, resistance, and voltage on a conductive wire influence each
other.
3. The greater the resistance the stronger the value of the current.
4. There are differences in the value of resistance obtained during lab
work and the results of calculations.
J. COMMENTS
a. Before the lab starts, make sure the tools used are in good condition.
b. Check the completeness of tools and materials.
c. Students must understand the series whether it is arranged in series or
in parallel to the Ohm Law practicum.
K. REFERENCES
Durbin, et al. (2005). Electric Circuit. Jakarta: Erlangga
Fredrick. (2006). University Physics. Jakarta: Erlangga
Giancoli, DC (2014). Basic Physics Volume 7, Seventh Edition. Jakarta:
Erlangga.
Hayt, w. (1991). Electricity Series Sixth Edition Volume I. Jakarta: Erlangga.
Ishaq, M. (2007). Basic Physics of Electricity and Magnetism. Yogyakarta:
Graha Ilmu.
Rusdianto, E. (1999). Application of Basic Electrical and Electrical Concepts.
Yogyakarta: Karusius.
Serway, Raymond A. And John W. Jewett (2010). Physics for Science and
Binding Engineering. Jakarta: Salmeba Teknika.
Tripler, P. (1991). Physics for Science and Engineering. Jakarta: Erlangga
L. ATTACHMENT