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How does the Thickness of Wire Affect Resistance?

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  • Essay length: 824 words
  • Submitted: 15/12/2002
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GCSE Electricity and Magnetism

The first 200 words of this essay...

How does the Thickness of Wire Affect Resistance?

I have chosen to investigate the effect thickness will have on the resistance in wire.

Apparatus

* Wires of varying thickness

* Power pack

* Leads

* A voltmeter

* An ammeter

* Crocodile clips

Prediction

I predict that the thicker the wire, the lesser the amount of resistance. This is because as electrons pass through a circuit, they give off heat. The surrounding atoms use this heat as energy, which causes them to vibrate. As the electrons give off more energy, the atoms vibrate more, making it harder to allow the electrons to get through the wire. Therefore, a thinner piece of wire will create more resistance (because there is less space for the electrons to get though). See the diagram below for more explanation.

Method

1) Set up the apparatus listed above.

2) Set voltmeter and ammeter to correct settings.

3) Measure current and alter voltage when appropriate.

4) Record results.

Fair Testing

To make sure that my experiment is a fair test, I need to know the factors that could alter the

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