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Resistance of a wire

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Introduction

Resistance of a wire Aim I am going to be investigating the resistance of wire. I will be investigating this to see how the length of the wire will affect the resistance. Prediction I predict that, as the length of the wire increases, the resistance will also increase. This means that the length will affect the resistance. Resistance is caused by electrons bumping into ions. If the length of the wire is increased, the electrons bump into each other more often so there will be an increased resistance. I am assuming that the temperature will not change during my investigating. ...read more.

Middle

Then do exactly the same again but use voltages of 0.2 volts, 0.3 volts, 0.4 volts and 0.5 volts. This is so that when we work out the resistance (V/I) we will have three readings and can then take an average resistance. Then carry out the whole experiment again, varying the length of the wire in intervals of 150mm starting at 150mm and ending at 750mm. Once we have worked out the resistance, we can draw a graph to discover any relationship between the length and the resistance of wire. The equation for resistance = V/I Results Length of wire in MM Current in amps (controlled) ...read more.

Conclusion

in MM Average resistance in ohms V/I = I 1 750 MM 1.587 2 600 MM 1.214 3 450 MM 0.892 4 300 MM 0.622 6 150 MM 0.322 Conclusions I have found that as the length of the wire increases, the resistance also increases (provided the thickness of the wire is kept constant) and there is a relationship between how much it increases. I can conclude this because my graph shows that resistance is related to the length. So The theory behind these conclusions are: As the length increases the resistance increases. Resistance is caused by electrons bumping into ions. If the length of the wire increases, the electrons bump into the ions more so the resistance will increase. ...read more.

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