e placed at each end of the putty won’t squash the ends of the putty.The experiment will be repeated 10 times altogether, shorting the wire 2cm each time, to give a range of 20cm to 2cm. Safety precautions: Make sure that the circuit is properly connected before turning the power supply on, and do not touch the apparatus, especially the tested wire, in case the putty, until the power is switched off. The changing of the putty should only occur when the power is off. Do not carry out the experiment in wet areas, as water is a very good conductor. Do not switch on the power pack when there is no resistant wire (putty) and do not turn the power supply up too high, because normal laboratory wires may melt, and so might the putty. Do not handle experiment with wet hands. Place asbestos mat underneath putty for safety. Place a variable resistor in the circuit for safety to ensure that the current did not remain too large, but remained set at the same value throughout the experiment to ensure that the test was fair.Prediction:The factor I am investigating for this experiment is the length. The length will change throughout the experiment but not the area.I predict that when the length of the putty increases, so wills the resistance. I also think that the length of the putty will be directly proportional to the resistance of the putty, which means that there will be a direct relationship.So, overall, when the length of the putty gets bigger the resistance will get bigger too. Theory:I chose my prediction because; longer wires will cause an increase in resistance, because the electrons have to travel past more atoms and collisions than they do in shorter wires, in this case the putty. This means that it will take a longer time for electrons to past through a long piece of putty than a short piece of putty, and that is why there will be a big value in resistance. (The longer the putt...
