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An experiment to find how the length of a wire affects the resistance.

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Introduction

An experiment to find how the length of a wire affects the resistance

Aim

In this experiment I am going to find how the length of a wire may affects the resistance and voltage.

Processes

I will consider the connection between the length of wire and the electrical resistance being given off. I will change the length of the wire, but I am going to try to keep temperature and the diameter constant the same. The voltage and current will have to be steady before I attempt to work out the resistance.

Method

I will set up a circuit that is very similar to the diagram below. I will take the battery and connect it to the amp meter. This will measure the amperage/current in the wire. Next, I will join the length of constantan wire the circuit; this can be changed as I go through the experiment. I will then add a voltmeter parallel to the length of wire. This will measure the voltage through the wire.

...read more.

Middle

2.95

40

0.74

3.7

0.73

3.65

0.73

3.65

50

0.86

4.3

0.88

4.4

0.94

4.7

60

1.1

5.5

1.06

5.3

1.1

5.5

70

1.23

6.15

1.22

6.1

1.29

6.45

80

1.37

6.85

1.47

7.35

1.46

7.3

90

1.59

7.95

1.58

7.9

1.56

7.8

100

1.8

9

1.73

8.65

1.8

9

Experiment 4

Experiment 5

Length of constantan wire (cm)

Voltage (v)

Resistance (ohms)

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Conclusion

Improvements

If I were to do the experiment again, I could make some improvements to make the level of accuracy better.  For example, I could make sure that the joints/connections were jointed properly and would have to make sure I use the same equipment every time. I could also get a machine to measure the length of the constantan wire and do it in a larger team. I could also try to do the experiment several more times. This would improve my accuracy greatly; also I would check the wire and make sure it is perfect because this would affect amount of collisions.

Further work

If I was to do this experiment a different way I would simply change on of the key points I have listed above.

...read more.

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