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What factors effect the resistance of conductors

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Investigation 1 - Resistance What factors effect the resistance of conductors Diagram Plan: The task of this investigation is to find out the factors that affect the resistance on conductor. This will be done by performing experiment that try and investigate different proposed factor and to see whether they affect the resistance. There are many factors that affect the resistance of an object. It is determined by the nature of the substance of which it is composed known as the resistivity, the dimension of the object include the surface area of the wire conductor and the length of the conductor. (Advanced physics, 4th addition by Tom Duncan) The factors that will be investigating will be the type of material, the cross-sectional area and the length. The reason I am not going to investigate temperature is because it is difficult to measure the temperature within a wire. (Martin) Ohm's law says that the amount of current flowing in a circuit made up of pure resistance is directly proportional to the electromotive force impressed on the circuit and inversely proportion to the total resistance of the circuit. ...read more.


III. If I smell burning, I will turn the power pack off. Apparatus: A table 1 x power pack (to give varied voltage) 1 x voltmeter 1 x Ammeter 5x Wires (with crocodile clips) Wires of varied length Circuit diagram Ruler Method: I will set up the apparatus as shown in the diagram above. The resistance is going to be recorded at 7 different lengths. I have chosen to record the results at this amount of lengths, as it will give me a much more accurate result at the end of the experiment. As you can see in the diagram, I have chose to use a digital voltmeter instead of a conventional analogue voltmeter, as this can give me a much more precise result than an analogue meter. This is because the needle on an analogue meter could be bent and give me the wrong reading, but a digital meter does not involve needles, so would give a much clearer reading. The way to calculate the Resistance relies on this formula: Resistance = Voltage/current I will use the voltmeter provided to get the voltage, and the ammeter provided to get the current (in amps). ...read more.


This proves the fact that the longer the wire is; the more collisions there are between atoms and electrons. So if the wire increases in length, so does the resistance. If the wire decreases in length, so does the resistance. Evaluation: This experiment has gone satisfactory, but there have been certain things in the experiment that I have not been pleased with. Some of my results have turned out anomalous. This mainly being: 60cm Anomalous V I R 1 0.09 11.11 1.5 0.13 11.54 2 0.18 11.11 2.5 0.21 11.91 3 0.25 12.00 3.5 0.29 12.07 4 0.33 12.12 I have probably ended up with this anomalous result because of an error in recording my results. However, as you can see from my average resistance graph, the results are roughly on the same line, so this anomalous result did not do much harm when the results are averaged. I have noticed, now that I have finished my coursework, that there are a number of things I could have done to get more accurate results. Firstly, I would do the experiment using the width and the material used as a factor too, just to make sure that my averages are as correct as possible ...read more.

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