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# What Factors Effect the Resistance of a Wire?

Extracts from this document...

Introduction

Matthew Crites 10F

What Factors Effect the Resistance of a Wire?

## Choosing the Variable

Some variables that could effect the resistance of a wire are:

• Length of the wire.

The longer the wire, the further the electrons will have to travel so the more difficult it will be. So increasing the length of the wire should increase its resistance.

• Thickness of the wire.

The thinner the wire is, the more difficult it will be for electrons to move along the wire. Therefore the resistance should be higher in a thin wire than in a thick wire.

• Material that the wire was produced from.

Different materials have different strengths of attraction between atoms. The stronger the attraction, the higher the resistance is.

• The temperature of the wire.

As the wire is heated, atoms vibrate more so electrons cannot move along the wire as easily so resistance increases.

• How much light is on the wire.

Middle

This diagram shows how the preliminary experiment will be set up:

## Preliminary experiment

A preliminary experiment was performed to attempt to determine:

• What voltage to set the power pack to.
• What lengths of wire to investigate.
• What amperage to keep the current at.
• A suitable extent and range of evidence to be collected.
• How many times to repeat the experiment.

The circuit was set up as shown above in

Conclusion

## Prediction

I predict that increasing the length of the wire will increase its resistance because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion. That is, doubling the wires length will double its resistance. The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material, so if there is a larger number of atoms there will be a larger number of collisions which will increase the resistance of the wire. If a length of a wire contains a certain number of atoms when that length is doubled the number of atoms will also double. This means that the length of wire is proportional to its resistance so if you double the length of a wire, you double its resistance.

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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