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An investigation to see what factors affect how well a wire will conduct electricity.

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Introduction

Electric Current Flow in Wires I am going to carry out an investigation to see what factors affect how well a wire will conduct electricity. I am going to investigate the affect of resistance. The resistance is when electrons travelling through a wire collide with the atoms of the wire causing many collisions which slows the flow of electrons which finally causes the resistance. There are several factors that affect the resistance of a wire, the thickness, the length and what the wire is made out of. If the wire is thicker then there is more space for electrons to move, and there won't be many collisions with the atoms from the wire. The length will affect the resistance because the longer the wire the more the electrons will travel and the more collisions will occur therefore the resistance will increase. In my investigation I am going to see the affect of the length of the wire against the resistance. ...read more.

Middle

I can then work out the resistance by dividing the voltage by the current: Resistance = voltage Current To do my investigation accurately I will need to carry out fair experiments, to make these fair I will need to keep the same type of wire and the same thickness for each experiment. I also need to make sure the voltage on the power supply is the same. I also need to measure the length of the wire with a ruler and make sure the current is flowing through only one wire. To make my results accurate I am going to round my numbers to two decimal places, also the results must be reliable so I will repeat the investigation twice. When doing my experiments I will make sure that I do them safely, I can insure the safety by turning the power supply off each time I have finished an experiment, I will also make sure the amount of voltage through the wire is not too high so the wire becomes overheated. ...read more.

Conclusion

I said that when we increased the length by 10cm the resistance would also increase. This happens because as the length doubles the number of atoms doubles which causes collisions with electrons and slows the flow of electrons through the wire causing an increase in resistance. Evaluation I think I carried out my investigation accurately therefore I produced accurate results, and I think that repeating the investigation twice was enough. I think the best part of my investigation was obtaining my results, because when looking at my table of results and my graphs there are no anonymous results. I think this happened because we were accurate when doing each experiment and kept all the tests fair. I also think our practical work went well because we followed what we originally intended on doing and made no changes during the investigation. To improve my investigation I would take more accurate readings from the ammeter and voltmeter and round the number to one decimal place. To further my investigation I would use thicker and different types of wire. Overall I think the experiment went well as my results and prediction supported my conclusion ...read more.

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