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To investigate how the electrical resistance of a wire changes in relationship to its length.

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Introduction

Physics Investigation Of Resistance Aim: To investigate how the electrical resistance of a wire changes in relationship to its length. Prediction: I predict that as the length of the wire increases so will the resistance of it. I also predict that the rate at which the resistance of the wire increases will be directly proportional to the length that is increased each time. Hypothesis: As the length of the wire is increased, the number of collisions between the current carrying charged particles and with the fixed particles also increases. Therefore the value for the resistance of the wire becomes higher. Variables: In this investigation the only factor that will change is the length of the wire. Fair test: The purpose of this experiment is to investigate the change of resistance with different lengths of wire, therefore there is only one variable. The following factors must be kept the same each time in order for the investigation to be fair and to achieve accurate results. ...read more.

Middle

Accuracy: To ensure that the results I obtain are as accurate as possible, I will ensure that the following steps are taken, firstly making sure that each time the length of wire is measured it is measure to within the crocodile clips. I will also avoid using wire that is damaged and has kinks in it, as this could cause the resistance reading to be inaccurate. Lastly I will attempt to record the ammeter and voltmeter readings as soon as possible after the circuit has been set up, as a delay will cause the wire to heat up and give an imprecise reading. I intend to have to recordings for the voltmeter and ammeter, for each length of wire, with the use of the variable resistor. This will enable me to take an average, which will guarantee that are resistance results are as correct as they possibly can. Results: Length of wire Voltmeter 1st reading Voltmeter 2nd reading Average Length of wire Ammeter 1st reading Ammeter 2nd reading Average 5 0.83 0.07 0.45 ...read more.

Conclusion

This proves my predicted to be correct, as I also predicted that the rate at which the resistance of the wire increases would be directly proportional to the length that is increased each time. I conclude that this was true because the electrons in the current made more collisions as the length of the wire were increased; this caused the resistance to do the same. Evaluation: I felt that overall the results I obtained were accurate, and a true representation of the resistance of a wire at different lengths. I don't think that if I was to redo the experiment, that increasing the amount of readings I investigated would give make my findings any more accurate. I could however test different types of wires, to investigate which materials have the greatest resistance. Another possibility would be not to use a wire at all, as a rheostat does basically the same job, though is less complicated and has less room for error and inaccuracy. Siobh�n Commins 11E1 ...read more.

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