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# How the resistance of a wire varies with length

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Introduction

How the resistance of a wire varies with length by Robert Loose Introduction The purpose of this coursework is to find out how and why resistance varies with the different lengths of the wire and to study weither resistance obeys Ohm's Law. I will do so by writing the following coursework 'How the resistance of a wire varies with length'. I will write this coursewrork in the following order: Background Information, Prediction, Apparatus, Diagram, Method and How I Will Make it a Fair Test, Results, Graph, Conclusion and Evaluation. Background Information The bigger the resistance of the components in a circuit, the smaller the current. The wire connecting the components in the circuit is made of thicker copper wire. ...read more.

Middle

Apparatus For this experiment, I will obviously have to use the correct apparatus. The apparatus will be as follows: 1 Ammeter 1 Voltmeter 4/6 Leads Battery Pack Sellotape 50cm Constanton SWG 30 wire Crocodile Clips Ruler Diagram Method and How I Will Make it a Fair Test Firstly, I will set up the apparatus as the diagram above shows. To make sure that the temperature stays the same, the diameter stays the same, the type stays the same and the length stays the same, I will use the same piece of wire, and leave 2-3 minute gaps between each reading. I will record the voltage and current in at least five places. ...read more.

Conclusion

Resistance( ) 50 2.65 0.73 3.63 40 2.54 0.89 2.85 30 2.44 1.10 2.22 20 2.27 1.42 1.60 10 2.01 2.11 0.95 00 0.00 0.00 0.00 How I calculated the resistance: Eg. When the wire was 50cm long: Resistance=Voltage Resistance=2.65 Restistance=3.63 Current 0.73 Conclusion My overall conclusion is that the greater current there is, there is more resistance coming through. There is proof of this in the 'Average' results table at 0.73A, the resistance is 3.63 , at 0.89A, the resistance is 2.85 , at 1.10A, the resistance is 2.22 , at 1.42A, the resistance is 1.60 , at 2.11A, the resistance, is less. I believe this is because I probably did not set the circuit up correctly. I believe that the results have followed through correctly otherwise. ...read more.

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# Related GCSE Electricity and Magnetism essays

1. ## An experiment to find how the resistance of a pencil lead varies which the ...

heat gained from the current has dissipated by the time I take the next reading. * I will use the same degree of accuracy (0 D.P.) when measuring throughout, and I will also use the same ruler for consistency. Prediction I predict that as the length of the pencil lead increases the resistance will increase accordingly.

2. ## Resistance Coursework

I will also take the reading on the voltmeter as soon as possible so the heat does not affect the resistance. Obtaining My Evidence: During the investigation, I changed the length of the wire by 10cm to see if it affects the resistance and the amount of current I was going to use.

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