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# When the length of wire increases then the resistance will also increase in proportion to the length.

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Introduction

The Resistance of a Wire AT1 15th February 2002 AT1 The Resistance Of A Wire. Planning. Prediction. I predict that when the length of wire increases then the resistance will also increase in proportion to the length. I predict this because as the wire gets longer there are more atoms and so it is more likely that the electrons are going to collide with the atoms. So therefore, if the length of the wire is doubled then resistance should also double. This is because if the length of wire doubles then the number of atoms doubles causing twice the amount of collisions, slowing down the electrons and increasing the amount of resistance. My graph should show that the length is proportional to the resistance. If the temperature of the wire is kept the same, the resistance will change with the length, area and material. Length and area are connected with the number and size of molecules in the wire, these can easily be investigated. The resistivity is much harder because it involves molecules and atoms, which come in different numbers and density as well as the structure they are packed in. ...read more.

Middle

Material. The type of material will affect how many free electrons are able to flow through the wire. If there are a lot of atoms in the material then there will be a lot of electrons creating a lower resistance. If the atoms in the material are more tightly packed, then the electrons will have more collisions and the resistance will be bigger. Temperature. If the wire is gets hot then the atoms in the wire will begin to vibrate because they will now have more energy. This creates more collisions between the electrons and the atoms. More collisions means more resistance. Diagram. Obtaining Evidence. Results table (1st Experiment). Voltage Current Resistance Length (cm) 0 0 0 0 3.61 0.9 4.01 15 4.5 0.75 6 30 5.07 0.5 10.14 45 5.41 0.44 12.29 60 Results table (2nd Experiment). Voltage Current Resistance Length (cm) 0 0 0 0 3.53 1.07 3.29 15 4.53 0.773 5.86 30 5.09 0.56 10.18 45 5.43 0.4 13.25 60 Results table (3rd Experiment). Voltage Current Resistance Length (cm) ...read more.

Conclusion

Conclusion. 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 that 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, giving a greater resistance. Improvements. If I were to do this experiment again then I would ensure that lengths and thicknesses were measured more accurately to make it a better test. Another good method of improving my results would be to do it in a temperature-controlled environment. A good method of doing this would be to have cool air constantly blown over the test in order to keep it at the same heat. Taking more readings and of a wider range would also help me to gain a better average. These alterations would probably give me better results, and possibly remove my anomalous result. To expand on my experiment I would test the same wire but different widths of that wire to see if I got the same results then, this would further prove this theory. ...read more.

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