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# What variables affect the resistance of a piece of wire?

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Introduction

James Griver April 2001 What variables affect the resistance of a piece of wire? PLAN Aim: - To experiment whether the length of a piece of Nichrome wire affects the resistance in a circuit containing two batteries, a voltmeter, and an amp meter. Equipment List: - * 7 x connector wires * 1 x nichrome wire at varied lengths * 2 x 9V Battery * 1 x Variable Resistor * 1 x Ammeter * 1 x Voltmeter Method: - A circuit will be set up as shown below: Prediction: - In the experiment, I predict that the longer the length of wire, the higher the resistance is going to be. This prediction is made because the electrons travelling through the wire have a higher chance of colliding with the wire's particles stopping the natural flow of current. ...read more.

Middle

The recordings will be taken with values to two decimal places each time. OBTAINING EVIDENCE Results: - Reading # 1 2 3 4 5 Length V I V I V I V I V I 200mm 0.72 0.20 0.57 0.16 0.41 0.11 0.32 0.09 0.26 0.07 400mm 0.98 0.14 0.75 0.11 0.60 0.09 0.51 0.07 0.42 0.06 600mm 1.11 0.11 0.87 0.08 0.72 0.07 0.66 0.06 0.54 0.05 800mm 1.14 0.08 0.91 0.06 0.79 0.05 0.74 0.05 0.63 0.04 1000mm 1.15 0.06 0.99 0.05 0.88 0.05 0.80 0.04 0.71 0.04 Reading # 1 2 3 4 5 Average Length R ? R ? R ? R ? R ? R ? 200mm 3.60 3.56 3.73 3.56 3.71 3.63 400mm 7.00 6.81 6.67 7.29 7.00 6.95 600mm 10.09 10.88 10.29 11.00 10.80 10.61 800mm 14.25 15.17 15.80 14.80 15.75 ...read more.

Conclusion

The length of the wire is directly proportional to the resistance. To ensure further accuracy, there are certain things that could be changed in order to obtain better results: > Take a wider set of results. Possibly twice as many, then work out the average. > To further experiment on what factors affect the resistance of a wire, I could have tested the three other variables - the cross-section, the material and the temperature. > The experiment could have been carried in a controlled environment, allowing the temperature to remain constant and allow a fairer test. > The wires used in the circuit contain a certain resistance, therefore certain wires with less resistance could have been used. Information for this coursework was taken from Encarta '98, Physics Matters by Nick England, and GCSE Physics by Richard Parsons. ...read more.

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