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To make it a fair test the thickness, temperature and type of wire will be kept the same and voltage will be kept at setting 2 as in the 1st experiment. The main reason for using crocodile clips in this experiment is because (as well as the reasons mentioned in the 1st experiment) they can slide easily up and down the wire, making It easy to record the results at different lengths. Safety Using a low voltage setting (2v) will ensure maximum safety, by preventing over heating of the wire and possible burns on the skin and/or sparks.
I predict that the longer the wire the higher the resistance will be, because the electrons will encounter more obstruction when flowing through, the atoms of the wire will be like a blockade and the longer the blockade the harder it will be for the electrons to squeeze through the gaps.
The electrons are freed from the battey that is slowly deteriorating letting more and more electrons free, they move from negative to positive – the opposite direction to conventional current (the direction people thought electricity would flow). The highlighted metal, (constantan) is the metal I’m going to use in the second experiment. Ideally I would use Nichrome but there is a shortage of supplies so we couldn’t obtain a length of Nichrome wire so Constantan is the second best as it has the second highest resistance.
The testing for this experiment was sound; no faults were recorded because we had 3 sets of results making the results very accurate when getting an average the results for each test were also very similar anyway.
Although the averages were correct, I feel that in some parts of the tests we did not leave the wire to cool for long enough and so the resistance was amplified, next time I do the experiment I will leave the wire to cool for exactly 30 seconds and set a stop watch to records this. Another way of preventing the wire from overheating is by attaching a light bulb to the circuit to absorb the heat.
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