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The relationship between the length and the resistance of a piece of wire.

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Introduction

I am going to investigate the relationship between the length and the resistance of a piece of wire. I predict that, as you increase the length of the wire, the resistance given to the electrons flowing around the circuit increases. I make this prediction because if you increase the length of a wire, then you increase the number of atoms in the circuit which the electrons can collide with, and be 'resisted' by.

To perform the experiment I will need:

A battery cell, as an energy source for the circuit, a voltmeter to measure the voltage of the circuit, an ammeter, to measure the number of amperes in the circuit, and some wires.

My experiment is safe because all of the wires are insulated and have covered ends. To carry out the investigation I will:

1.

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Middle

Circuit Diagram

We worked very safely in this experiment, we did not need to wear goggles or eye protection because all the wires had covered ends on them and the equipment was safely set out on the bench.

We set up a circuit using the circuit diagram, then the teacher checked it before we switched it on.

When we measured our results we did it in a systematic way (i.e. 10cm, 20cm, 30cm, etc..).

We did the experiment three times to make sure that there were no anomalous results. We found a trend which said that, the longer the wire, the greater the resistance. We recorded the results in a table like this:

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The results were definite enough because they showed what I had predicted would happen, and with no anomalies.

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Conclusion

The results in my table and on my graph are not from a single experiment, they are an average from a set of three.

Andrew Todd - 10ND - Physics Coursework

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