# Study on how different parameters can affect the resistance of a wire.

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Introduction

## Introduction

This investigation is to study how different parameters can affect the resistance of a wire. I will be testing this by using a number of different variables, which include the type of material of the wire, the length of the wire and the diameter of the wire. With these changes I will hopefully be able to prove or disprove my hypothesis:

Planning:

The hypothesis of this investigation is:

## Resistance in the wire becomes higher as the length of the wire increases, the resistance varies depending on what material the wire is made out of, the resistance is becomes lower as the diameter (SWG) of the wire increases.

In this investigation I will predict to see whether this hypothesis is stated true or false. In this early stage of the investigation I have predicted that the hypothesis stated it true.

This is because as a wire increase length electrons travelling along will encounter more atoms of the to pass thought making the resistance increase unlike in a short piece of wire where there would be fewer atoms making the electrons pass through quicker equalling the resistance to be low.

The diagram above shows that a long piece of wire contains more atoms then a small piece of wire making it harder for electrons to pass increasing the resistance

The diagram above

Middle

So the wider the wire and shorter the wire, the less resistance it has. In most wires today, copper is used because it is a good conductor. We will be proving this and looking at other wires thickness and length to prove this theory.

## Variables

The variables that I will be changing during my investigation are:

∙Length

∙Material of wire

∙Diameter

These three factors have been changed, as they will all be affecting the resistance of the wire, which will hopefully prove of disprove my hypothesis:

## Resistance in the wire becomes higher as the length of the wire increases, the resistance varies depending on what material the wire is made out of, the resistance is becomes lower as the diameter (SWG) of the wire increases.

The ranges of wire length I will use in the experiment would be from 20cm to 100cm. The range of diameter of wire that will be use in the experiment would be from 36 to 28 SWG. The material range that will be used in the experiment will be from three types of wire Constantan, Copper and Nichrome.

I will do the investigation on each material, length and diameter twice so I am able to put more plots on my results graphs so I am able to see if there is a clear correlation or not. It will also enable me to make an average of my results and not base my average on one result.

Conclusion

- I did not do the experiment enough times.
- I had only done the experiment once
- I did not get an average.
- I have only collected 10 results for each test

All of these errors have influenced the planning of my investigation because now I will:

- Do the experiment twice
- Get 20 results for each test done
- Get an average

The safety precautions that I will need to take are:

- To stand instead of sting down in case the wires fall onto me or near me
- To make sure voltage isn’t to high so that it is dangerous.
- To tie back hair and lose objects so they do not interfere with my experiment.
- To make sure I don’t not touch wire when electricity is passing though.
- To dry hands in case they are wet to prevent an electric

shock.

When I have collected all of my results I will analyse them by putting the data into tables consisting of two headings:

- Amps
- Voltage

I will analyse them by drawing graphs, adding lines of best fit, working out a gradient and then working out a resistance and plotting graphs of the resistance so that all the data can be analysed In a table easily.

With this I will be able to determine how different materials, lengths and SWG’s of wire can effect he resistance helping to prove or disprove my hypothesis.

By putting the data into tables I can find an average of how different materials, lengths and SWG’s of wire can effect he 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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