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Resistance through a wire coursework

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Introduction

Resistance through a wire coursework Aim: Investigate how the length of a wire affects the resistance of a wire. Apparatus Lists: Power Pack Ammeter Voltmeter Thin Wire Crocodile Clips Connecting Wires Meter Ruler Preliminary Work Metals conduct electricity because the atoms in them do not hold on to their electrons very well, and so creating free electrons, carrying a negative charge to jump along the line of atoms in a wire. Resistance is caused when these electrons flowing towards the positive terminal have to 'jumps' atoms. So if we double the length of a wire, the number of atoms in the wire doubles, so the number of jumps double, so twice the amount of energy is required: There are twice as many jumps if the wire is twice as long. The thinner the wire is the less channels of electrons in the wire for current to flow, so the energy is not spread out as much, so the resistance will be higher. ...read more.

Middle

Accuracy I will do my best to read the ammeter and voltmeter accurately as possible trying not to make a mistake. I will make sure that the crocodile clips are placed properly at the right length. I will allow a few seconds for the ammeter and voltmeter to settle before writing the results down. Prediction and Hypothesis: I predict that if the length of the wire increases then the resistance will also increase in proportion to the length. I think this because the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the length is doubled the resistance should also double. This is because if the length is doubled the number of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance. My graph should show that the length is proportional to the resistance. First Results Length of Wire (cm) ...read more.

Conclusion

My results are presented in a table to show the resistance through a wire. In my prediction I said that as you increase the length of the wire you also increase the resistance and from the results table you can see that the prediction I made was absolutely correct. My results don't show anomalous results, which prove that the experiment went well. I think that I did everything I could to keep this experiment fair as possible. The problems that I had was to set up the equipment but I soon figured it out. The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material, so if there is a larger number of atoms there will be a larger number of collisions, which will increase the resistance of the wire. If a length of a wire contains a certain number of atoms when that length is increased the number of atoms will also increase. ...read more.

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