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# To investigate how the thickness and length of the wire in a circuit effects the flow of electrons through a circuit

Extracts from this document...

Introduction

George Clarke                                                                                                  28-04-07

Physics Coursework

Aim:To investigate how the thickness and length of the wire in a circuit effects the flow of electrons through a circuit.

The variable, which I am changing, is resistance.  I am going to do this by changing the length and thickness of the wire.  I will control this variable by using the same kind of wire.  I will also use the same wire board, micrometer, cables and crocodile clips.  I will also not heat the cable, as this will decrease resistance.

Prediction: I think that as the length of the wire increases so to will the resistance of it. I also believe that the rate at which the resistance of the wire increases will be directly proportional to the length.

Reason: with electricity, the property that transforms electrical energy into heat energy, in opposing electrical current, is resistance. A property of the atoms of all conductors is that they have free electrons in the outer shell of their structure.

As a result of the structure of all conductive atoms, the outer electrons are able to move about freely even in a solid.

Middle

4.1

4.1

10.6

10.6

50

2.5

2.5

5.1

5.1

13.2

13.2

60

3.0

3.0

6.1

6.1

15.8

15.9

70

3.5

3.5

7.0

7.0

18.9

18.4

80

4.0

4.4

9.0

8.9

23.9

23.9

90

4.4

4.4

9.0

8.9

23.9

23.9

100

4.8

4.9

10.0

10.0

26.2

26.2

Area of wire:

Area of each thickness:

We recorded the three different wires’ diameters using a micrometer.

Thick =0.55mm

Medium=0.35mm

Thin=0.22mm

To get the area of the cross section we used the equation

The areas of the cross-sections were;

Thick=               0.2375mm

Medium=               0.096mm

Thin=                      0.038mm

To then get the total area we

Conclusion

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 – perhaps were we had a bar that did not bend in place of the wire. We could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit

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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