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# Resistance of a wire

Extracts from this document...

Introduction

Resistance of a wire

Introduction

Resistance is the opposition a material offers to the flow of electricity. The electrical resistance of an object is not only by what material it’s made of, but also by its shape. A very thin copper wire has more resistance than a thick copper wire of the same length. A very long copper wire has more resistance than a short one of the same thickness. Resistance is measured in Ohms.

Variables

There were three variables that our group was able to choose from; the length of the wire, the area of the wires cross section (thickness) or the type of wire (constantan or nichrome). All of these variables are able to change the resistance of the wire.

Here are my thoughts and predictions on what would happen to the resistance of the wire as you change the variables.

Middle

2.81

40cm

3.36

0.56

6

60cm

3.75

0.41

9.15

80cm

4

0.33

12.12

100cm

4.15

0.28

14.82

 SET 3 Wire Volts Amps Ohms 20cm 2.61 0.92 2.84 40cm 3.4 0.58 5.86 60cm 3.84 0.4 9.6 80cm 4.01 0.33 12.15 100cm 4.14 0.28 14.79
 SET 4 Volts Amps Ohms Ohms 20cm 2.67 0.9 2.97 40cm 3.44 0.58 5.93 60cm 3.84 0.42 9.14 80cm 4.04 0.33 12.24

Conclusion

To carry out further investigation I would change the type of wire to constantan and carry out the same experiment using the same measurements. I would compare the results and see what differences would occur. I would expect that the resistance would be higher on one of the types of wire but I am unsure which. on one of the types of wire it would be. It depends how much electricity they are able to conduct. on one of the types of wire but I am unsure which. It depends how much electricity they are able to conduct.

Amy Drummond

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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