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Investigating how the length of a wire affects the amount of electrical resistance.

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Introduction

Year 10 GCSE Coursework - Investigating how the length of a wire affects the amount of electrical resistance. Prediction and Planning The aim of this investigation is to find out if the length of a wire affects the amount of electrical resistance. Looking at the problem, I think that the longer the wire the more resistance there will be. I think that the factors that affect the experiment are the Material the wire is made from, the Temperature of the wire, the Wire Width, and finally the Wire Length. The variable I will be changing is the wire length. I predict that as the wire length increases, the amount of resistance will increase in proportion to the length. I predict this because the longer the wire, the more atoms there are so the free electrons are more likely to collide with other atoms I will carry out my experiment by setting out the apparatus as it shows below. ...read more.

Middle

Voltage Amps Resistance (?) 10 0.15 0.36 0.41 20 0.31 0.35 0.89 30 0.47 0.34 1.38 40 0.63 0.34 1.85 50 0.79 0.34 2.32 60 0.93 0.34 2.74 70 1.08 0.34 3.18 80 1.34 0.34 3.65 90 1.22 0.27 4.52 100 0.96 0.21 4.57 10 0.16 0.32 0.48 20 0.3 0.32 0.94 30 0.45 0.32 1.41 40 0.6 0.32 1.88 50 0.76 0.32 2.38 60 0.88 0.32 2.75 70 1.04 0.32 3.25 80 1.2 0.32 3.75 90 1.32 0.31 4.26 100 1.52 0.33 4.61 10 0.14 0.32 0.44 20 0.29 0.31 0.94 30 0.45 0.32 1.40 40 0.66 0.36 1.83 50 0.81 0.35 2.31 60 1.02 0.36 2.8 70 1.18 0.37 3.2 80 1.l22 0.33 3.69 90 1.32 0.32 4.16 100 1.62 0.35 4.62 This table shows the average resistances of the previous table. With this I can draw an accurate graph. Length (cm) Resistance (?) 10 0.44 20 0.92 30 1.39 40 1.85 50 2.34 60 2.76 70 3.21 80 3.70 90 4.31 100 4.6 See line graph Analysis and Conclusion From the graph I ...read more.

Conclusion

There were no absolute anomalous results, but my results were not all perfect. I think that the problems with my experiment were that the electrical current going through the wire caused it to heat up which meant there was an increase in resistance and that because the wire was coiled, it was very difficult to straighten and to get accurate measurements. Therefore if I were to repeat the experiment I would let the wire cool down more often than in the last experiment, carry out the experiment in a temperature controlled area and carefully lay out the wire so that it is completely straight. I would also change the circuit to the circuit below so the voltmeter is only reading the voltage in the wire, not the whole circuit. Another way to improve the accuracy of my results would be to change the crocodile clip ends of the wires from the voltmeter to be slimmer and more accurate. To expand the experiment you see how the different widths and materials of wire affect the resistance in relation to its length. ...read more.

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