EXPERIMENT 8
INTERNAL RESISTANCE OF CELLS
Name: Jay Baiabe
ID: S11206168
Course: PHF03
Group: Two(2)
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Introduction
In this experiment, the internal resistance of two cells—one old and one new—will be compared,
and the emf of each cell will also be determined in this experiment.
Aim
to examine cell combinations and measure the internal resistance and emf of the cells.
Apparatus
1. Rheostat
2. Voltmeter
3. Ammeter
4. Switch
5. Connecting wires
6. 2 dry cells (one new and one old)
Procedure
As per lab manual page 73 & 75
Results
Cells
Estimated Voltage(Volts)
Measured Voltage(Volts)
A
0
0
B
2
1.9
C
1
1.5
Old
Cell
Voltage(Volts)
Current(Amps)
1.41
1.3
1.25
1.0
0.95
0
0
0.1
0.2
0.3
New
Cell
Voltage(Volts)
Current(Amps)
1.5
1.4
1.3
1.25
1.2
0
0.1
0.2
0.4
0.5
Graphs
1,6
1,4
1,2
Voltage(Volts)
1
0,8
Ряд1
0,6
0,4
0,2
0
0
0,1
0,2
0,3
Current(Amps)
0,4
0,5
0,6
Discussion
During the experiment, there are errors occurred that affects the results. No proper equipment, for
example the ammeter and voltmeter used was not really proper function, from the results there are
some value affected.
Conclusion
After the experiment we were able to combine connection, measure resistance by using a voltmeter
to find voltage(V) and ammeter to determine Current(I) then calculate the resistance using the
formula, R=V/I.
References
(USP Foundation physics B, 2023, pp. 73-75)
Sample calculation
Post-lab activity
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