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# An Investigation To Find Out About The Resistance Of A Wire!

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Introduction

G.C.S.E. Physic’s Coursework

An Investigation To Find Out About The Resistance Of A Wire!

## Introduction

In this experiment I will be trying to find out how the resistance in a circuit changes as the length of a piece of wire changes by getting longer or shorter.

## Prediction

My prediction is that the shorter the wire gets the resistance will decrease with it and the longer the wire is the higher the resistance will be.

I have found through research on the Internet, some evidence that can back up my prediction, this research is that a wire is made up of molecules, which act as an opposition to the flow of electrons. This means that longer the length of wire the more molecules there are to oppose the flow of electrons which will result in a higher resistance for a longer piece of wire and a lower resistance for a shorter piece of wire.

Middle

 Length of Wire(cm) Voltage(V) Current (A) Resistance (ohms) 100 8 1 10 80 8 0.8 8 60 8 2 7.5 40 7 2.8 5 20 7 2.9 2.5
 Length of Wire(cm) Voltage(V)

Conclusion

I could have probably got a slightly better set of results if I had repeated the experiment another couple of times and then I would have acquired another average.

##### Evaluating my Results

Here again I am pleased with the end product. I do think that I took enough measurements, as I was able to obtain an average set of results. Therefore I was able to check my first test outcome and was also able to repeat it. Once I had repeated it I found that I got a similar set of results as in the first test, this meant that I had completed the first test using the right method.

I think that all of my results show a good relationship between the length of wire and the resistance as the follow the same sort of pattern. Not exactly on a straight line but along the outside a bit.

Vicky Jackson 11Mr

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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