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Physics Coursework: How does the length of putty affect resistance in a circuit? I was asked to find out what changes the resistance of conductive putty, therefore I could have tested many variables. Length, Density, Temperature, Cross Section and Substance. I tested the variable of length to find out the change of resistance. Method I will repeat the experiment 3 times, thus making the test fairer by using averages. I will mark the putty with lines, one centimetre apart from each other for 10cm. The putty will be placed on insulating material. I will move the 2 metal conductors, used to complete the circuit, by inserting them into the putty, and changing the distance 1cm at a time, all of which will be repeated 3 times, therefore leaving 30 individual results, which I shall average. The circuit is shown in the diagram below. The circuit involves a Ammeter and a Voltmeter, therefore I am...

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