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What Factors affect the resistance of a wire?

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Introduction

What Factors affect the resistance of a wire? By Sarah Woolley Introduction Resistance occurs when the electrons travelling along the wire, collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. The resistance of a wire depends on certain factors. Some variables that will affect the resistance of a wire in this investigation are: * Length * Thickness * Temperature * Voltage * Material In this experiment, I will be changing the length of the wire, to see how this will affect the resistance of the wire. ...read more.

Middle

Other variables, voltage, thickness, and temperature will be kept constant throughout the experiment. Apparatus The apparatus I will be using for the experiment are: * Ammeter * Voltmeter * 1 meter of 30 SWG wire * 2 crocodile clips * Variable resistor * Power supply * Wires * Metre ruler Diagram Fair testing To make the experiment a fair test, I will make sure that I use the same apparatus, I will also make sure that the thickness and the material of the wire I am using is at a constant. ...read more.

Conclusion

Prediction I think that if the length increases, then the resistance will also increase. I think this is because if the wire is longer, there are going to be more atoms, so it is more likely that the electrons are going to collide with the atoms. So if the length doubles, the resistance should also double. This is because if the length is doubled, the number of atoms will double, resulting in twice the number of collisions, slowing the electrons down, and increasing the resistance. Results Length of wire (cm) Voltmeter reading Ammeter reading Resistance 100 3.6 0.30 12 80 3 0.34 8.8 60 2.8 0.40 7 40 2.2 0.45 4.8 20 1 0.56 1.7 ...read more.

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