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Investigate any relationship present between the distance between a solar cell and a lamp, and the current output of the solar cell, at a fixed voltage.

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Introduction

Solar Cell Experiment

Introduction:

Solar Cells convert light energy to electrical energy, so are transducers.

Aim 1: To investigate any relationship present between the distance between a solar cell and a lamp, and the current output of the solar cell, at a fixed voltage.

Aim 2: To investigate any relationship present between the power supplied to a bulb, and the current of a solar panel, at a fixed distance apart.

When investigating a solar cell, there are several variables we could investigate. Below, I have analysed all the variables that could be investigated, and evaluated which one I will investigate. When considering what variables of the light I could investigate, several things come to mind.

Variable 1: Light

Light has different colours, and different coloured lights are known to have different frequencies. This in turn would cause the different coloured lights to emit different levels of power. We know that this is the case because when combining the two below formulae, we can see that energy and frenquency are related.

Wavelength x Frequency= Wave Speed

Planck’s Constant x frequency= Energy

The second formula states that frequency is directly proportional to energy.

When rearranging the first formula to display frequency as the subject of the formula, and then substituting the value for frenquency given (wave speed/wavelength) into the second formula, we get:

...read more.

Middle

Safety Precautions

When conducting these experiments, there are not many safety issues, because we will not be dealing with high currents/voltages. The heat of the wires and the lamp may be hazardous to touch; therefore we will not touch these when they are on.

Results: Distance Experiment

Distance (cm)

Bulb Current Output (mA)

1

2

3

Av

5

100+

100+

100+

100+

10

35

36

31

34

15

16

16

14

15.33333333

20

10

9

8

9

25

6

6

5

5.666666667

30

4

4

4

4

35

2

3

3

2.666666667

40

2

2

2

2

45

2

2

1.5

1.833333333

50

2

2

1.5

1.833333333

55

1.5

2

1.5

1.666666667

60

1.5

1.5

1

1.333333333

65

1

1.5

1

1.166666667

70

1

1

1

1

75

1

1

1

1

80

1

1

1

1

85

1

1

1

1

90

1

1

1

1

95

1

1

1

1

100

1

1

1

1

On this table are the results of the first experiment. In this experiment, I varied

...read more.

Conclusion

On the last graph, the results curve up at the end. This is the closest thing to anomalous results I could find, but this may be a correct finding, or may be not, but if it is not correct, it could be the fault of bad result noting (only I did the experiment, so had to read 4 meters at once).

If I were to redo this experiment, I would do it in a completely dark room, and have results taken automatically, by a computer, and investigate the changes between different frequencies (colours) of light.

When looking at the graphs I made with my results that I took, I can see that generally there are very strong trends, but there are some anomalies in my data. Looking at the graph for my second experiment, the one where distance is plotted against √(1/output of current), we can see several anomalous points.image01.png

To expand this investigation, we could investigate light colour as a variable, to see if light colour actually does affect the current output in the solar panel.  

...read more.

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