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"resistance of different thicknesses of wire"

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"resistance of different thicknesses of wire" Introduction For my GCSE physics coursework I must investigate the affect of the thickness of wire has on the current flowing through it. This will be done by choosing different cross-sectional areas of wire that are 30cm long and connect it to a functioning circuit and record the current using a ammeter and the voltage using a voltmeter which help you work out the resistance of the circuit. Aim My aim is to identify what happens to the resistance when you change the nickel chrome wires that have different cross-sectional areas. Research Resistance It is a property of a substance that restricts the flow of electricity through it, it is associated with the conversion of electrical energy to heat, also the magnitude of this property. Resistance depends on many factors, such as the nature of the material like; it's temperature, dimensions and thermal properties, degree of impurity, the nature and state of the illumination of a surface, and the frequency and the size of the current. The SI unit of a resistance is the ohm. Ohm SI unit ( ) of electrical resistant that restricts the flow of electrons through it and is worked out by the V=IR rule meaning Resistance= Voltage Current Nickel (the wire material) ...read more.


it's all connected properly, especially the ammeter and the voltmeter because you can easily put the wires in the wrong positive and negative ports. If this happens a -0.00 will appear on the ammeter, to change this you must change the wires round. Get a set of wires that have different cross-sectional areas (in our case we had 0.27cm to 0.71cm wire width) and place it in the circuit connecting it in carefully between the two crocodile clips exactly the length that you want to test (in our test 30cm). If they are not exactly the width you want apart it will be an unfair test because they shorter the distance the easier it will be for the electrons to get to the other end because less energy is used to heat the wire and move the electrons. Once in its place record the current and the voltage from the ammeter and voltmeter to 2 decimal places and place in a chart, and from this you can work out the resistance by using R=V rule. I Once the results are recorded take the wire out and repeat the test again with the different piece of wire of the same length and record the results again as many times as possible in the time available but we will only have time to do each test twice. ...read more.


The main variable that affected our results was probably the length in between the crocodile clips that affected the length the current had to travel along the wire. This variable stood out a couple of times during the test especially the 0.32 test because the resistance results where too high for its wire width because it did not fit into the curve on the graph and 0.38 test the gap of the final resistance results were too large to give a very accurate average result, although there are some small inaccuracy's they are not strong enough not to give a good conclusion of how the width of a wire affects its resistance. Despite some of the results varying a bit, but the procedure we used was appropriate for what we wanted to do though. If I had to change something though I would change the way we did the measuring of the wire and placing it in the circuit, so we made sure they were 30 cm apart because that is what gave us the iffy results because the length of the wire changes the resistance of the wire. For further work relevant to this experiment we could find out how other variables such as the length and temperature of the wire affect the resistance of the wire. This would help us understand better how resistance varies under different conditions ...read more.

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