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Investigate how the resistance of a wire changes due to different factors experimented on it.

Extracts from this document...

Introduction

PHYSICS COURSE WORK

PLAN

Aim

Investigate how the resistance of a wire changes due to different factors experimented on it.

Factors

Factor 1 – The length of the wire may affect the wire’s resistance. According to the length of the wire, current, voltage and resistance may change. For example it may occur that the shorter the length of the wire, the higher the voltage and the lower the current meaning that resistance of the wire should increase.

Factor 2 – The type of wire may affect the wire’s resistance. For example if the wire is copper then it may occur in the experiment that the resistance may decrease due to the fact the current is higher then it would be in a different type of wire.

Factor 3 – The thickness of the wire may have an affect on the wire’s resistance. It may occur that the resistance decreases because the wire is thin or that when the wire is at its thickest the resistance will be at its highest.

Factor 4 – The temperature applied on a wire may have an affect on its resistance. For example it may mean at a higher temperature there might be more voltage applied across the wire meaning there will be more resistance.

I have chosen to investigate the length of the wire.

Prediction

I predict that the longer the length of the wire, the higher its resistance.

...read more.

Middle

40

60

80

100

Preliminary results

Before my experiment to help me I did some preliminary results, this was to help me with my real experiment. By doing these preliminary results it enabled me to get some sort of idea about doing the experiment I am doing and what kind of results I should get from it.  This helped me in writing up this plan.  

Length of wire (cm)

Voltage (V)

Current (A)

Resistance (OHMS)

20

2.14

3.64

0.58

40

2.76

2.36

1.16

60

3.03

1.67

1.81

80

3.27

1.39

2.35

100

3.41

1.21

2.81

On page 4 there is a graph of my results:

.




OBSERVATIONS

From my experiments these are the results I collected:

1st set of results

Length of wire (cm)

Voltage (V)

Current (A)

Resistance (OHMS)

20

2.18

3.82

0.57

40

2.75

2.27

1.21

60

2.96

1.68

1.76

80

2.96

1.26

2.34

100

3.32

1.11

2.99

2nd set of results

Length of wire (cm)

Voltage (V)

Current (A)

Resistance (OHMS)

20

2.16

3.63

0.59

40

2.78

2.35

1.18

60

3.05

1.66

1.83

80

3.29

1.38

2.08

100

3.43

1.20

2.85

...read more.

Conclusion

Although having said this I feel that I could have made my results even more accurate. I could have done this by noting down the resistance each time after increasing the length of the wire by 10cm instead of noting down the resistance after increasing the wire by 20cm each time.  

However, my results are reliable because I made sure that my experiment was fair. I did this by keeping the power pack on 4 volts through out the experiment, by keeping the thickness of the wire the same through out the experiment, by keeping the type of the wire the same through out the experiment, by noting down the exact results on the ammeter and voltmeter and by following the method correctly.

My results are also reliable because they followed the scientific theory of ‘as the distance between the ends of the conductor increases, the resistance will also increase.’ This is shown on my graph in the observations.

Some additional work could have been done in this experiment. I could have seen how the resistance of the wire is affected by the other key factors, which were mentioned in my plan. For example the thickness of the wire and the type of the wire.

Overall, I feel my experiment worked well and was a success.

   

...read more.

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