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To find the resistance of wire.

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Physics GCSE Practical Assessment Investigation the resistance of wire Aim: To find the resistance of wire. In the past in school lessons I have learnt things to do with circuits and resistance. I know how to use formulas to work out the resistance of certain things and know how to use equipment such as Voltmeters and Ammeters, I also know how to set up circuits that use these things. Variables The following is a list of variables I could change in the investigation: * Temperature * Length of wire * Thickness/Diameter * Voltage across wire * Current through wire * The type of wire I am going to investigate what will happen to the resistance when I change the Length of Wire. I am using this variable because most of the other variables would be to simple or to complicated to use: The temperature of the wire would be hard to record because it is near impossible to find the temperature of the wire with the equipment I have. The thickness of the wire is hard to measure to, It could be done be it wouldn't be a very precise experiment. I did not choose to change the type of wire because of the simple reason that I cannot plot the results on a line graph, which is a better way of analyzing my results. ...read more.


* I will empty the contents of my boiling tube through a sieve into the sink so the marble chips don't clog up the drain. * I will immediately clean up any breakages I may make so nobody gets cut by broken glass. Preliminary Work From my preliminary work I have learned how much acid and marble to use in order to make my experiment run long enough to plot 5 points, I found 10ml of acid and 1 gram of small marble chips would be enough to slow the experiment down to 2 minutes 30 seconds so I could record the measurement on the burette every 30 seconds. I have also learned how to use a burette and record to 0.1 of a cc. Results Here are two tables of results I recorded in my experiment from my first try of the experiment and when I repeated it, they show how much gas was released from the experiment. I have changed the table since I made my plan and it now shows how much water I used with the acid to make it up to ten milliliters. Try 1 Amount of Acid/Water/ml Time/Seconds 0 30 60 90 120 150 10/0 0 4.1 19.2 32.5 41.4 50.0 8/2 0 4.0 15.8 20.9 36.7 44.7 6/4 0 3.8 9.2 19.7 27.6 34.1 ...read more.


I could do the experiment three or more times instead of two, so when I made an average table it would even out the results even more so I wouldn't get any anomalous results on my graphs. Most of my measurements fit on my graphs and a line of best fit can be drawn without any anomalous points being noticeable, but on a few graphs you can see the anomalous points and can make out they do not fit in with the rest of the results on the graph. On my results tables you an see that on some occasions the results do not make a pattern, for instance the bottom line of my first results table is considerably different to the other points on the table: If I were to do the experiment a second time I would definitely repeat the experiment at least double the amount of times I repeated this experiment so I could get a better graph and be able to evaluate the results better. I conclude that making the concentration of acid higher speeds up the rate of reaction and making it lower slows the rate down. What I predicted in my prediction turned out to be right and seemed to be right at least for most of the results I gained. Scott Johnston Page 1 ...read more.

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