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To investigate and find out what factors affect the resistance of a wire

Extracts from this document...

Introduction

Resistance Wires

Aim:

To investigate and find out what factors affect the resistance of a wire.

Planning:

What I already know:

An electrical current is made up of lines of free electrons moving in the same direction.  Resistance occurs when the free particles of the current collide with the fixed particles of the wire.   As resistance increases, so must the voltage needed to push the current through the wire.   If the length of wire increases, resistance will increase because more and more voltage is needed and less and less current is getting through the wire.   Resistance is measured using Ohms law, Resistance (R) = Voltage (V) divided by Current (I).

Factors:

There is only 1 factor involved – the length of wire.   This affects the results I will get in the ways mentioned above.  

Variables:

The variable I will change is the length of wire.   The variable I will measure is resistance.

...read more.

Middle

1.6

0.9

1.77

18

1.9

0.7

2.71

24

2

0.65

3.07

30

2.1

0.56

3.57

36

2.2

0.5

4.4

42

2.2

0.42

5.24

48

2.2

0.38

5.79

54

2.2

0.35

6.29

60

2.2

0.32

6.88

66

2.3

0.3

7.66

72

2.4

0.28

8.57

This is my results table from my 1st experiment.

At the back of this file, there is a graph showing these results.

...read more.

Conclusion

 experiment and my repeat experiment seem to differ considerably.    My 1st experiment only reaches as high as 8.37 ohms of resistance.   Whereas on my repeat experiment a figure of 11 ohms was reached.   The most likely explanation was that the first wire I used differed in diameter to the second wire I used.

Evaluation:

My biggest mistake as mentioned above was choosing two different wires in two different lessons, as they seemingly differed in diameter, which caused a change in resistance.   Wire 1 seems to have given the more accurate results as there are few anomalous results and the results go up in an almost perfect straight line.

Wire 2 has a much more curved line and there are many anomalous results.

Luckily, I had enough reliable and accurate readings to support my conclusion.

If I repeated the experiment I would knowingly test a wire with a wider diameter so that I could prove that the type or wire does have a conclusive impact on resistance of a wire.

...read more.

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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