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How does the length of nichrome wire effect resistance?

Extracts from this document...

Introduction

Dave Holbrook - Resistance

How does the length of nichrome wire effect resistance?

Aim

My aim is to find out how much of a change there is in resistance in relationship with the length of nichrome wire I use within my circuit.

Prediction

I predict that the longer the wire, the higher the resistance. This is because the longer the wire, the more times the free electrons will collide with other free electrons, the particles which make up the wire and any other impurities within the wire. Therefore, more energy is going to be lost in these collisions (as heat energy).

Also, doubling the length of the wire should almost double the resistance. This is because by doubling the length of the wire we should also be doubling the collisions that will occur. Obviously for this to take place I would have to make it a fair test.

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Middle

0.3

0.43

15

0.20

0.3

0.66

20

0.27

0.3

0.99

25

0.35

0.3

1.16

30

0.42

0.3

1.40

Experiment 2

Length (cm)

Voltage (V)

Current (A)

Resistance (W) (to 2 d.p.)

10

0.13

0.3

0.43

15

0.20

0.3

0.66

20

0.27

0.3

0.99

25

0.35

0.3

1.16

30

0.42

0.3

1.40

Experiment 3

Length (cm)

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Conclusion

Most of my mistakes would probably have come from the cutting of the wire, this would have been due to the fact that trying to hold a pieces of bent wire next to a ruler and trying to snip at the same time proved very difficult. Also trying to attach the crocodile clips on at each end was a bit of a task.

I do not think that doing any more results in our experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method

Dave Holbrook - Resistance

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