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# 'Length of Wire' Data Analysis. My results show a positive correlation between the length of the wire and the resistance

Extracts from this document...

Introduction

Results

 Length of Wire (cm) Attempt 1 Attempt 2 Attempt 3 Average resistance for the 3 attempts (Ω) Voltage(V) Current(A) Resistance (Ω) Voltage(V) Current(A)

Middle

0.28

4.82

0.83

0.17

4.88

0.95

0.22

4.32

4.67

50

1.36

0.27

5.04

0.95

0.19

5.00

1.01

0.19

5.32

5.12

60

2.02

0.3

6.73

1.6

0.23

6.96

1.7

0.25

6.80

6.83

70

2.45

0.29

8.45

1.99

0.23

8.65

1

0.17

5.88

8.55

Analysis

Ohm's law states the relationship between the current, voltage and resistance,

voltage (V) = current (I) x resistance (R). By using Ohm's law I was able to work out the how the length of a wire affected the resistance. A component will only obey Ohm's law at a constant temperature. This is because a higher temperature causes the atoms in the component to vibrate. This leads to a greater amount of collisions with the electrons and the atoms increasing the resistance. Due to this the wire must be left to cool down between tests.

The resistance of a circuit is often linked to a water pipe. This is known as the hydraulic analogy where each electronic component is represented by a hydraulic equivalent.

Conclusion

To further boost my confidence in my conclusion I could carry out the experiment with a greater range of lengths which would make my line of best fit more accurate , I could also carry out more repeats for each length as this would allow for a more accurate average thus leading to more reliable data. I could also carry out an alternative experiment measuring how the width of a wire affects the resistance. The length of the wire would be my controlled variable and the width would be the independent variable. This would give me an even greater understanding of how the resistance could be affecting by the size of the wire and I could compare the results of the two experiments to see how differently the width and length of a wire impact the resistance.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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