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# What affects the resistance of a wire?

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Introduction

John Greenfield 5290 48139 What affects the resistance of a wire? Planning Analysis Resistance is a property of materials, which determines how easily charge can flow through them at a particular voltage. Resistance is measured in units called ohms (?). We can calculate resistance with the equation: R=V?I Resistance = Voltage ? Current Many things affect the resistance of a wire. Some factors are: * The density of particles - the material used * The temperature of the wire * The length of the wire * The thickness of the wire * Voltage * Material of the wire Of these variables, my experiment will be the thickness of the wire. ...read more.

Middle

The first wire is stretched and the positive crocodile clip is attached at 0cm and the negative at 50cm. The wire is then left on the circuit for 5 minutes to heat up. Once the wire is heated up, the variable resistor is adjusted so that the voltmeter reads 2V. For the experiment, the voltage will be kept the same, at 2V dc, from the power pack. The ammeter is then read, and the resistance recorded. The same procedure is carried out for the other pieces of wire. Analysis Results Length (cm) Thickness (mm) Average Thickness (mm) Voltage Amps Ohms 50 0.27, 0.27, 0.28 0.27 2 0.42 0.84 50 0.25, 0.27, 0.27 0.26 2 0.41 0.8 50 0.50, 0.49, 0.50 0.5 2 1 2 50 0.45, 0.44, 0.46 0.45 2 0.92 1.84 Analysis of Results The graph is an inversely proportional curve. ...read more.

Conclusion

This is because we didn't choose enough pieces of wire to chose, and the micrometer differed quite a lot. If more pieces of wire were used, the results would have been more accurate because there would have been more results to compare it with. We could also have done with doing either a preliminary experiment or a second set of results, or maybe both. For the second set of results, different equipment would have needed to be used to make sure the apparatus we were using wasn't faulty. As these results had a range of only 4 readings, and were not repeated, and that the results are not 100% accurate, then I would say that these results are not strong enough to base a firm conclusion on. This is because there are so many sources of error, which have been explained earlier. ...read more.

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