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My aim is to find out how different cross sectional areas of a wire affects the resistance.

Extracts from this document...

Introduction

Wired

Aim

My aim is to find out how different cross sectional areas of a wire affects the resistance.

Factors

  • Length of wire- The greater the length the greater the resistance.
  • Type of wire- the material the wire is made from will have an effect.
  • Cross sectional area of wire- The greater the thickness the lower the resistance.
  • Amount of current
  • Amount of Voltage
  • Temperature the wire gets to due to friction that may occur- The greater the temperature the greater the resistance.

Measurements

We will use an ammeter to measure current and a voltmeter to measure volts. This is good equipment to use as my aim is all to do with resistance. And the equation for resistance is

Resistance = voltage/current

In symbols this is

R= V/I

Prediction

The reason for resistance in wire is because of the composition of the atoms, which a particular wire is made of, and the arrangement of the atoms of these metals. When an electron passes through the wire, the electrons hit these atoms while making the journey from one end to the other giving opposition or resistance to the electrons. When this happens electrons move a force such as voltage, and in hitting these atoms, also creates heat via friction of the electrons and atoms.

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Middle

0.79

9

0.09

0.79

10

0.07

0.78

2nd

How many wires

Voltmeter(volts)

Ammeter(amps)

1

0.46

0.63

2

0.25

0.66

3

0.17

0.64

4

0.13

0.63

5

0.12

0.64

6

0.10

0.65

7

0.08

0.65

8

0.07

0.65

9

0.07

0.63

10

0.05

0.62

3rd

How many wires

Voltmeter(volts)

Ammeter(amps)

1

0.55

0.76

2

0.29

0.78

3

0.25

0.79

4

0.22

0.74

5

0.16

0.81

6

0.15

0.79

7

0.09

0.79

8

0.09

0.81

9

0.08

0.80

10

0.07

0.80

Cross sectional

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Conclusion

As you can see on the graph I have ringed two points which seem slightly wrong as they aren’t really part of the curve.

Reliability

I think my investigation was quite reliable but when I put the wire in the circuit by the crocodile clips I didn’t always measure the wire inside the crocodile clips so this probably made a difference to the results. Also when we kept adding the wires I didn’t realize for a while that it would be better to twist the wires around each other so sometimes the wires made not have been connected aswell as they could have been. So if I did the experiment again I would make sure the wires we all twisted round each other and that I measured the wire each time.

Further investigating

If I wanted to find out more about resistance I could try the other factors that affect it,

1) Type of wire- This would tell me whether the material of the wire affects the amount of resistance or not.

2) Length of wire- This would tell me if the resistance is more in a shorter length of wire or a longer one.

This way I would gain a better knowledge of resistance.

By Paula Takle

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