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Investigation: Factors affecting the resistance of a wire

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Introduction

Investigation: Factors affecting the resistance of a wire Task: I will identify factors which affect the resistance of a wire and pick one to investigate in a fair test. Key Variables: The key variables in this investigation are: 1/.Thickness. In this experiment I will keep this variable constant. Throughout the experiment, the thickness of the wire will be a 24 gauge wire. 2/.Temperature. In this experiment I will keep this a constant variable as controlling the temperature of wires would be very difficult. 3/.Length. In this experiment I will vary this variable to see how it affects the resistance of the wire. 4/. Material. In this experiment of I will keep the variable of using different types of metals constant, I will be constantly using Constantine. Prediction: I predict that if the length increases then the resistance will also increase in proportion to the length. Theory: I think this because the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. ...read more.

Middle

the conditions in which the tests are taken are all as similar as possible To make my experiment reliable, I will take several sets of results and figure out the mean average and base my graph and final results from that. Safety: To make sure the experiment is carried out in safest possible way, the apparatus will need to be switched off when not in use to make sure it doesn't over heat, and touching any apparatus that may get hot should be avoided. All loose clothing should be tucked in and long hair tied back. Results: Set One Length Of Wire(cm) Voltage (V) Current (I) Resistance(ohms) 10 0.1 0.45 0.2 20 0.2 0.44 0.5 30 0.24 0.43 0.6 40 0.35 0.41 0.9 50 0.39 0.4 1 60 0.49 0.39 1.3 70 0.52 0.37 1.4 80 0.59 0.37 1.6 90 0.68 0.35 1.9 100 0.7 0.28 2.5 Set Two Length Of Wire(cm) Voltage (V) Current (I) ...read more.

Conclusion

Evaluation I think my experiments were quite accurate as I performed them fairly and properly, this is demonstrated by the good set of results that I have gained. To try and improve my accuracy, I performed the experiment twice to get two sets of results, and could therefore find an average which would give me a better accuracy. I don't appear to have any outstanding anomalies that show up on my scatter diagram, only a minority of points don't quite fit on my line of best fit and these are quite close to it anyway. These could have been caused by the temperature of the equipment rising or my measurements being slightly inaccurate. I could have improved this experiment by performing it several more times to get a more fair average. I could have also used more accurate equipment but what I used was all that I had available to me. Another way I could have improved this investigation would have been to experiment with another thickness of wire and investigate the similarities/differences between the two. ?? ?? ?? ?? ...read more.

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