Aim: To Find Out How Resistance Varies In A Length Of Wire - page 1
Keywords: To Find Out How Resistance Varies In A Length Of Wire , Resistance, Ohms Law, Electrons Positive Nuclei
By Mose. on 01/09/2008
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 1 of 5 pages: 1 2 3 4 5
To Find Out How Resistance Varies In A Length Of Wire
Plan
To answer my aim mentioned above, I am gong to conduct an experiment. In this experiment I will be keeping the following factors the same; material of wire, the thickness of wire and the voltage passed through the wire. I will be changing the length of wire, as this is my aim; to find out how Resistance behaves in different lengths of wire.
I am going to use ten different lengths of wire; 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, (cm). For each of these measurements I am going to do three repeats. This is to ensure accuracy of my results, and eliminate the possibility of an anomalous result; this in turn will make my experiment a fair test. In addition, I will also ensure, that the voltage remains the same throughout, as an incorrect voltage would, alter the outcome of my collected results. I will accurately determine and outline the measurements I am using, by means of a meter rule. I will keep the thickness, and type of wire used the same, as this could alter the actual resistance, as mentioned above. Also to ensure the event of error within my results I am going to dismantle my equipment and put it back together again.
I am going to use an analogue meter in order to keep my measurement of my chosen voltage constant accurately. Also to ensure that I am accurate with my 10 measurements I am going to stretch the wire along a 1m rule, and use crocodile clips to make sure that I get the exact measurement each time on my metre rule.
Prediction
I predict that as I increase the length of my wire, the greater the value of resistance will be. This is because, in a shorter wire, there are a much smaller number of positive nuclei, opposing the flowing electrons; therefore there is less resistance, as more of the electrons are able to flow through the wire. However if we have a longer piece of wire, there is a greater number of positive nuclei, opposing the flowing electrons, hence increasing the value of resistance.
As a result of the structure of all conductive atoms, the outer electrons are able to move about freely even in a solid. When there is a potential difference across a conductive material all of the free electrons arrange themselves
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