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What affects the resistance of a wire?

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Physics Investigation Title: - What affects the resistance of a wire? I am going to investigate what affects the resistance of a wire when current is passed through different lengths. There are a number different things that could affect the resistance, for example; * the thickness of the wire * the length of the wire * the voltage passed along the wire I am going to test the length of wire because if I were to test the thickness the data can only be discrete i.e. it can only take a specific value like shoe size, so the wire could only be 3mm or 4mm therefore I am testing the length because there are 10 different values between 7cm and 8cm. I predict that the greater distance of wire, the higher the resistance. I think this because there will be more friction along the wire as there is more wire to pass through. ...read more.


Then I will proceed to move the crocodile clip up the meter rule stopping at every cm and taking the reading and recording it in a table. The test is a safe one therefore I cannot make it any more safe than it already is unless I earthed the battery pack which I believe would be unnecessary. Length Test1 Amps/Volts Test 2 Amps/Volts Test 3 Volts/Amps Test 4 Amps/Volts Test 5 Amps/Volts Average Amps/Volts 0cm 1.90* 0.0 1.90* 0.0 1.85 0.1 1.90* 0.0 1.85 0.0 1.90 0.00 10cm 1.80* 0.2 1.85 0.3* 1.80* 0.3* 1.80* 0.3* 1.75 0.4 1.80 0.3 20cm 1.60 0.4 1.70* 0.5* 1.70* 0.5* 1.65* 0.5* 1.65 0.6 1.68 0.5 30cm 1.50 0.5 1.60 0.6* 1.55* 0.6* 1.57* 0.6* 1.56* 0.7 1.56 0.6 40cm 1.45* 0.8* 1.55 0.8* 1.49* 0.8* 1.49* 0.8 1.41 0.8 1.47 0.8 50cm 1.40* 0.9* 1.48 1.0 1.40* 0.9* 1.40* 0.9* 1.33 1.0 1.40 0.9 60cm 1.30* 1.0 ...read more.


My graph shows a strong positive correlation that curves upwards. As I predicted the longer the length of wire, the more resistance there was as R=V/I therefore the resistance equals the voltage divided by the current. Evaluating Results I think that my results are accurate because I took a lot and then took the closest three assuming that they were the most accurate. There are a few anomalous results but none of which are included in the average. I think that they are anomalous for two reasons, one I could have mis read the meter or two there was a bad connection between the clips. I think that the procedure was not unsuitable but at the same time it wasn't a perfect experiment as some times the tape would be on the ten centimetre mark so we could not take an accurate measure but we got past that by removing the tape. To improve the experiment I could use digital meters instead of an analogue meter or could have a more accurate rule/measurements. ...read more.

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