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# A small fan can be driven by a 3-coil dc. motor, this investigation aims to inspect and explore this - examine the relationships between voltage, current, power and the frequency of the five-bladed fan.

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Introduction

Tom Mathews Page  of

PHYSICS – INVESTIGATION OF A FAN

AIM

A small fan can be driven by a 3-coil dc. motor, this investigation aims to inspect and explore this.

For my investigation I have decided to examine the relationships between voltage, current, power and the frequency of the five-bladed fan.

HYPOTHESIS

I expect there to be a positive correlation between voltage and frequency, so as the voltage is increased the fan will spin faster, meaning the time period will decrease.

Also, using the formula ‘Power = Current x Voltage’ (P=IV) I would expect the power output to rise quite significantly as the voltage is increased due to it being calculated by the product of two rising values.

METHOD

The fan was secured to the bench using a g-clamp. This was due to the fact that, in preliminary experiments, with sufficient current the fan was capable of propelling itself along the surface. This was unsafe as

Middle

0.07

42.00

23.81

1.00

0.11

0.11

34.00

29.41

1.20

0.13

0.16

30.00

33.33

1.40

0.16

0.22

32.00

31.25

1.60

0.19

0.30

24.00

41.67

1.80

0.20

0.36

21.50

46.51

2.00

0.23

0.46

20.00

50.00

2.20

0.26

0.57

19.00

52.63

2.40

0.30

0.72

18.00

55.56

2.60

0.33

0.86

16.00

62.50

2.80

0.36

1.01

15.00

66.67

3.00

0.39

1.17

14.00

71.43

DATA ANALYSIS

The graph of voltage against current shows one very similar to what I had expected. The trendline shows a near perfect, positive correlation, with only a factor of minus 0.0055 preventing it from being exactly directly proportional. This is most

Conclusion

I can also conclude that the time period of the fan is inversely proportional to power.

EVALUATION

If I had an accurate digital meter which could have been used for gaining more accurate figure on both the voltmeter and the ammeter, I think that not only could the anomaly have been avoided, but also the graphs may have been perfect straight lines.

There is one anomalous result which has constant and reoccurring effects throughout my experiment. Though I have highlighted this result, and plotted it as separate data to avoid it altering trendlines, if I had had sufficient time I would retake at least the two readings that caused it. In fact accuracy as a whole could have been improved, but that would mean taking more sets of data to keep finding mean results, for which time constraints took control.

In general I think that my experiment has been a success as all hypotheses I set out to determine, and more, have been proven one way or another.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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