Furthermore, the resistance of a metal increases as its temperature increases. Obtaining evidence This is the method that will be carried out to connect the circuit and achieve the specified results: I will try to make this investigation as accurate as possible.
However, due to my line of enquiry, I will only change the length of the wire. Variables There are different variables that can be changed in this experiment; these are the independent variable.
The electrons in the longer wire will obviously take longer to get past the atoms than in the shorter wire. How is it measured? Once the equipment has been tested, we then set up the circuit that we will use to take the readings.
Variables Safety I will ensure experimental safety by confirming that all the wires are connected properly and that none of the insulation on the wires is worn. I will then turn the power pack on and record what Resistance of a wire essay example and ammeter readings. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot.
I think that the amount of times that we did the tests were appropriate and this was enough to satisfy me and my partner that we had a set of reliable results. When an electric current passes through thin Constantan wire, the electrons cannot flow easily.
However, I made sure that the wire remained straight throughout the experiment. How is it measured? A wire has electrons colliding with the Atoms If the length is double then the electrons are doubles, as well as Atoms and therefore resistance.
Using the equipment that has been checked we set up a circuit using the Meter ruler with wireconnecting wires, ammeter, voltmeter and power pack. To make the results are reliable as we are able to receive, we will conduct the three times and find the resistance.
The tools we used were far from simple but were not as complex as tests conducted in a laboratory would of been, for example the way the wire was straightened, if this were to of been done in a laboratory, then the wire would of been near perfectly placed and straightened.
For example, electrons pass easily through copper wire, but much less easily through Constantan wires. In addition, I will make sure I turn the power pack off after each reading. Again, I will record the voltmeter and ammeter readings and turn off the power pack. I have taken three reading and have worked out the average, shown in red.
It was done with precision, accuracy and the results produced were reliable. The number of free electrons depends on the material and more free electrons means a better conductor, i.
Below is a table illustrating the effect of changing the variables see Table 2: T Physics Coursework Dr Redman. To test the theory I would perform the test on an increased range of lengths to see what further affect it would have on the resistance.An Investigation into Factors Affecting Resistance of a Wire Essay - An Investigation into Factors Affecting Resistance of a Wire Plan: The possible variables I could use to find out factors affecting resistance are material wire is made of, length of wire, temperature and cross sectional area of wire.
Apr 19, · For example, when the length of the wire is 20cm the resistance is ohms; when the length of the wire is 40cm the resistance is ohms, which is roughly double.
In my main investigation I will see if this observation applies to my mi-centre.coms: GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire Task To investigate how the resistance of a wire is affected by the length of the wire.4/4(1).
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An Investigation of the Factors That Affect the Resistance of a Wire. 1, words. 3 pages. An Experiment to Determine Wire Resistance with Varying Wire Diameter.
9 pages. The. Resistance of a Wire Investigation Essay example - Resistance of a Wire Investigation Electrical resistance is the property of any object or substance of resisting or opposing the flow of an electrical current.
I also predict that if the resistance in the wire increases, then the thickness of the wire will decrease. My diagram of my circuit: For my first investigation task I will be doing a preliminary test to find out which are the best wires to use for my investigation.Download