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Physics Coursework Investigating Resistance of wires and its relationship to length.

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Introduction

Physics Coursework Investigating Resistance of wires. For my physics coursework I am investigating the resistance of wires. When a metal wire is placed on an electric circuit the voltage from the battery makes the electrons flow through the wire. As they do so, they collide with the metal ions and this process slows down the flow. Resistance is a measure of how easily the electrons can move through the metal, a low resistance means that the electrons can move easily so a high resistance means that the electrons can't move very easily. Atoms are made up of a positively charged nucleus surrounded by negatively charged electrons. In solids one or two of the outer electrons in each atom are used to form the bonds between atoms that hold the solid together. In a metal these bonding electrons are free to move through the entire solid. These are often referred to as free electrons. An electric current is a flow of charged particles and when a voltage is applied to a metal, the free electrons can flow through the metal. This is shown in the diagram above. ...read more.

Middle

I did the experiment twice it would mean I could get two sets of resistance results therefore I would be able to work out the average resistance and plot my graph well. First Experiment: Nichrome Length (mm) Voltage (v) Current (i) Resistance (?) 200 2.29 1.07 2.14 300 2.37 0.74 3.20 400 2.41 0.57 4.23 500 2.44 0.46 5.30 600 2.46 0.39 6.31 700 2.47 0.33 7.48 800 2.49 0.30 8.30 900 2.51 0.27 9.36 1000 2.63 0.25 10.52 These results seem to me to be accurate. They show a correlation, for voltage, the higher the length the higher the voltage, and for current, the higher the length the smaller the current. This makes me think that my results, for my first experiment are reliable. I included the resistance in this table because putting the resistance in on this first table made it easier for me when I came to draw up the resistance table because the resistances were already worked out. I knew it would make it easier for me which is why I did it. Second Experiment: Nichrome Length (mm) Voltage(v) Current(i) Resistance (?) ...read more.

Conclusion

I would like to have tried a higher voltage to see what effect that would have had on my results however I would not of been able to go up too much higher otherwise it would have been an unsafe experiment. If I were to do it again I would also test Copper and Constantin 2 or 3 times to ensure Nichrome was the best to use. However I think my experiment as it is has proven the resistance of wires and has answered my title therefore achieving its purpose. I believe I have explained and justified all my decisions in my investigation and in my opinion these decisions aided the outcome of the investigation. As a whole I am confident in my investigations outcome and believe I have identified all the problems I had with this experiment and explained the reasons they happened and how I solved them. I have also explained what I could have done to improve my experiment and have explained how my results are accurate and reliable and what in my experiment proves my results are accurate and reliable. ?? ?? ?? ?? ...read more.

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