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To investigate how the resistance of a wire is affected by changing the length of a wire.

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Introduction

Physics coursework. Aim:- To investigate how the resistance of a wire is affected by changing the length of a wire. Resistance is the force, which stops the flow of an electrical current around a circuit so that energy is required to push the charged particles around a circuit. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. Resistance is affected by a number of things, these are: Temperature: because if the wire is heated up the atoms in the wire will start to vibrate more because of the increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This means that there will be an increase in resistance. Material or type: Firstly the material you use must be a conductor or no electricity will flow at all. W will be using a metal wire to measure what affects its resistance. But there are different types of wire. ...read more.

Middle

To prevent it from affecting the experiments accuracy. The only thing that will be changed is the length of the wire. I chose this as my variable because after researching into the factors that affect resistance. I thought that this would be the easiest to make sure it was accurate and would draw the most conclusive results. I decided that to be able to draw a clear conclusion from my results I would need to do a maximum of 10 experiments and a minimum of 6. We were given a length of wire a meter long, as the longest length of wire we could use. We then divided it up so that we would be taking 10 readings at: 10cm, 20cm, 30cm, 40cm, 50cm, 60m, 70cm, 80cm, 90cm, 100cm. I then needed to decide what voltage would give us the most accurate results and which type of wire to use. So I decided to carry out preliminary experiments in order to make the decision. The preliminary experiments would also help me to familiarise myself further with the method, and if I came across any problems I could correct them. I would them be able to obtain precise and reliable results in my main experiment without any of these difficulties. ...read more.

Conclusion

I predict that as I increase the length of wire the resistance will also increase. I predict this because I know that if you increase the distance the electrons must travel. You in turn increase the chance of more collisions occurring. Meaning that there will be a greater resistance. I also predict that the increase in resistance will be directly proportional to the increase in wire length. I predict this because I think that if you double the wire length you will double the resistance. If the length of wire increase and the resistance increase are directly proportional. I predict my graph will look like the one below. Resistance Wire length Results Results for experiment 1 Results for experiment 2 Length in (cm)_ Voltage Current Resistance Voltage Current Resistance 10 0.58 7.35 0.08 0.37 8.5 0.04 20 0.73 6.3 0.12 0.72 6.7 0.11 30 0.92 5.2 0.18 0.87 6.1 0.14 40 0.99 5 0.2 0.97 5.6 0.17 50 1.03 4.51 0.23 0.99 5 0.2 60 1.17 4.5 0.26 1.13 4.6 0.25 70 1.22 3.92 0.31 1.14 4.4 0.26 80 1.21 3.9 0.31 1.22 4.3 0.29 90 1.32 3.69 0.36 1.26 3.8 0.33 100 1.41 3.3 0.43 0.99 5 0.2 length in (cm) average resistance 10 0.06 20 0.12 30 0.16 40 0.19 50 0.22 60 0.26 70 0.29 80 0.3 90 0.35 100 0.32 ...read more.

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