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How does the resistance of Nichrome wire change as its length changes?

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Introduction

image00.png

Aim: How does the resistance of Nichrome wire change as its length changes?

Plan: image11.pngimage09.pngimage10.pngimage07.pngimage08.pngimage02.pngimage05.pngimage06.pngimage03.pngimage04.pngimage01.png

First we connected the equipment as shown in the diagram above. The equipment that we will be using is as follows:

Lengths of Nichrome wire: To pass the current through.

Power Pack: To send the voltage through the Nichrome wire.

Crocodile clips: To hold onto the Nichrome wire during the experiment.

Voltmeter: To measure the voltage.

Ammeter: To measure the current.

Connecting wires: To connect the wire.

Ice Pack: To keep the Nichrome wire cool during the experiment.

Stop clock: To measure the time period.

I have chosen to use Nichrome wire because from my preliminary results I found that this wire had the highest resistance, as copper burned up on the lowest voltage possible on the power pack and also in my preliminary test I found that the Nichrome wire would burn up you placed it up higher than 4 volts. This was the reason why we placed an ice pack on the wire to keep it at a low temperature; another reason is that we know that if the temperature is too high then the resistance also becomes higher.

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Middle

Results

After collecting the two sets of results I placed them into tables.

The tables are shown on the opposite page.

The first table is only of the results received from the experiment, while the second table is of the same first table except with the resistance added to it.

Length of wire (in cm)

Voltage

Current

10

0.9

1.75

20

1.04

1.16

30

1.13

0.78

40

1.17

0.64

50

1.21

0.53

60

1.24

0.45

Resistance table:

Length of wire (in cm)

Voltage

Current

Resistance

10

0.9

1.75

0.5142857

20

1.04

1.16

0.8965517

30

1.13

0.78

1.4487179

40

1.17

0.64

1.828125

50

1.21

0.53

2.2830189

60

1.24

0.45

2.7555556

Resistance Graph:

image12.png

These tables

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Conclusion


As well as making these modifications I would also improve my Investigation by testing the same wire but different widths of that wire. I would do this to expand on my Investigation.

From the graph on the previous page I can see that the resistance of the wire is proportional to the length of the wire. I know this because the Line of Best Fit is a straight line showing that if the length of the wire is increased then the resistance of the wire will also increase.

Conclusion

In my prediction I said that:
If the length increases than the resistance will also increase in proportion to the length.
From my graph I have shown that my prediction was correct, as the Line of Best Fit is a straight line proving that the resistance of the wire is proportional to the length of the wire.
The length of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion.

By Scharlie Tamar Anthea Robinson

Candidate Number: 8122

14343

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