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To find what affects the resistance of a piece of wire.

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Introduction

Aim To find what affects the resistance of a piece of wire. Prediction I predict that as long as I increase the length of the wire, the resistance of it will increase. Wire is made up of particles that are all made up of atoms. The more wire there is, the more atoms there will be. This affects the resistance of the wire. Resistance is simply defined as the ease with which electrical current passes through a substance. If I were to predict what the graph would look like, it would be like this: The reason for this is that I believe if I double the length of the wire, the resistance of the wire will double. Inside a substance the atoms are constantly vibrating and, the more vibrating atoms there are, the greater the difficulty there is for the current to pass through it. Some of my prediction was based on my preliminary tests/trials. Length of wire (cm) Current (A) Voltage (V) 100 ==> 0.45 2.04 90 ==> 0.49 2.01 80 ==> 0.55 1.97 70 ==> 0.61 1.94 60 ==> 0.70 1.92 50 ==> 0.78 1.84 40 ==> 0.95 1.76 30 ==> 1.20 1.64 20 ==> ======== ======== I also think that there will be some kind of correlation between the resistance of the wire and its length. ...read more.

Middle

The reason for this is that alternating current would confuse the readings on the multi-meters. Variables We have been instructed only to vary the length of the wire, rather than anything else. From my rough trials I have decided to keep the voltage low in order to ensure that the wire does not get damaged, thus hindering the rest of the experiment. Results Length (cm) 1st Experiment Current 1st Experiment Voltage 2nd Experiment Current 2nd Experiment Voltage 3rd Experiment Current 3rd Experiment Voltage 100 0.39 1.91 0.40 1.90 0.42 1.91 95 0.41 1.88 0.44 1.87 0.43 1.89 90 0.43 1.86 0.46 1.86 0.45 1.87 85 0.45 1.85 0.48 1.84 0.47 1.85 80 0.47 1.83 0.49 1.81 0.49 1.83 75 0.49 1.82 0.50 1.80 0.51 1.81 70 0.51 1.81 0.52 1.78 0.53 1.79 65 0.55 1.79 0.55 1.75 0.55 1.76 60 0.58 1.77 0.57 1.73 0.57 1.75 55 0.62 1.75 0.60 1.72 0.59 1.73 50 0.63 1.73 0.62 1.70 0.61 1.71 45 0.66 1.70 0.64 1.67 0.67 1.69 40 0.75 1.64 0.74 1.64 0.72 1.63 35 0.81 1.60 0.80 1.61 0.79 1.58 30 0.89 1.56 0.87 1.57 0.85 1.56 I gathered these three sets of results; I decided to gather three sets to ensure that I have got an accurate enough average for each one. ...read more.

Conclusion

the wire cool down before the next experiment, however, I neglected to compensate for the fact that as the resistance of the wire got higher, so to did the heat of the wire, which in turn meant that I needed to allow the wire more time in which to cool down. In order to rectify this mistake, I would need to measure the temperature of the wire before the experiment, and then ensure that I allow it to return to that temperature before each new test. There is however a disadvantage to this, as it wastes valuable time waiting for the wire to cool, and our time was limited. I could extend my work further by investigating other factors that would affect the resistance of a piece of wire, such as it cross-sectional area, and I could also experiment with different types of metals. It would be interesting to compare these results with those from a metal such as nichrome, which has a very high resistance. I could also use the notion of particle vibration in my other two investigations, which would give me a definite answer as to weather my theory about particle vibration is correct. Matthew Young 11JSM2 Physics Investigation Mr.Rayfeild ...read more.

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