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Laura Roach Transformers
Transformers
This experiment investigates if the number of turns of wire around a C-Core
affects the voltage.
Equipment
C-Cores
Voltmeter
Crocodile Clips
Wire
Power Pack
Method
1.
2.
3.
4.
5.
Wrap 20 turns around the primary C Core.
On each end of the wire attach a crocodile clip.
Connect this C Core to the power pack.
On the secondary C Core wrap a piece of wire around it 5 times.
Plug this into a voltmeter, one wire into the common, and one into volts. Turn
the voltmeter to Ac volts. This is because we are using an AC current.
6. Turn on the power pack and connect the two C Cores.
7. Take the reading off the voltmeter.
8. Repeat this step increasing the number of turns by 5 each time. Do this up to
40 turns.
Picture
Laura Roach Transformers
Results
Number of spins
5
10
15
20
25
30
35
40
Voltage
0.3
0.7
1.1
1.5
2.0
2.4
2.9
3.3
Conclusion
A graph to show how the number of turns of wire affects the voltage
3.5
3
Voltage
2.5
2
Series1
1.5
Linear (Series1)
1
0.5
0
0
10
20
30
40
50
Number of turns
I can conclude that the greater the number of turns of wire the greater the voltage.
The graph shows that this increase in voltage is proportional, because the line of best
fit is straight.
Laura Roach Transformers
Evaluation
I believe that that these results are quite accurate and there are no anomalies, as the
line of best fit touches every point. However to make sure that these result were
correct and make sure that they were even more accurate, if I was to do this
experiment again I would take at least 3 repeats and then find the average.
Secondly if I was to do this experiment again, I would ensure that pieces of wire
used were long enough rather than having to attach more wire to another piece to
extend the wire. Whilst this is unlikely to affect the results, this could be a factor that
could possibly alter the accuracy of the results, so it would be important to eliminate
this factor.
Thirdly, to investigate further I would carry out an experiment in which I would
alter the amount of wire around the first C –Core to see if this affected the voltage as
well. I would keep it as a constant number of turns though out the experiment whilst
changing the number of turns around the second C-Core. I believe it would be
interesting to find out if a greater number of turns around the first C-Core would give
a bigger voltage on 5 turns. I predict that the larger the number of turns on the first
C-Core the larger the starting voltage on 5 turns on the second C- Core, because there
would be a larger magnetic field.
This experiment was limited because often the wire was not long enough, if a
longer piece of wire was used it would be possible to investigate the voltage with an
even larger number of turns.