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An investigation to find out the factors that affect the resistance of a wire

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Introduction

Science Investigation An investigation to find out the factors that affect the resistance of a wire Name: Sheena Bheeroo Candidate Number: 7226 Centre Number: 15215 Centre Name: Ashcroft High School Year: 10 Set: 1 Date: P /8 O /8 A /8 E /6 SPAG /3 PLANNING Aim: As the title suggests, what I intend to do in this experiment is find out what factors will affect the resistance of a wire. For example, if the length of a wire is shortened, then will the resistance increase or decrease. Fair test: In order to make this experiment a fair test, to obtain reasonable results, only one thing can be changed. All the other factors/variables would have to remain exactly the same. For example, if the length of the wire were being decreased at a reasonable measurement range then that would be the only thing that should be changed. The type and thickness and voltage should not changed, otherwise that could affect the results obtained. Safety As in every scientific experiment, safety precautions must be followed. The safety measures to be taken here are as follows: * A heatproof mat must be placed underneath the wire, in case the wire gets too hot. ...read more.

Middle

Volt Meter (Volts- V) Resistance (R= V/I) 1m 0.22 2.6 11.8 90cm 0.24 2.6 10.8 80cm 0.27 2.6 9.6 70cm 0.33 2.6 7.9 60cm 0.4 2.6 6.5 50cm 0.6 2.6 4.3 40cm 0.66 2.6 3.9 Length Type Ammeter (Amps- A) Volt Meter (Volts- V) Resistance (V/I) 1m 26 1.325 4.5 3.4 1m 28 0.945 4.5 4.8 1m 30 0.655 4.5 6.9 1m 32 0.495 4.5 9.1 1m 32- Copper 7.175 4.5 0.63 As the above results tables show, as the wire decreases in length the resistance decreases too and the longer the wire, the longer the wire, the lower the resistance. Therefore my prediction was correct. The reason the resistance is lower is because it has less space to move through when the wire is shortened. The resistance was calculated by dividing the voltage by the current. The table shows the various lengths of the same wire (34 constantan) and their resistance. If observed carefully, you will find that there is not much difference between each one. The difference, ranges from 0.5 to 1.5. Therefore as you will see in the graph, the resistance is constant. In order to obtain accurate results, as a group, we used a digital ammeter to measure the current. ...read more.

Conclusion

However when it came to the 32-copper wire the resistance was very high. I expected it to be high because it was one of the thinnest wires, however not that high. I suspect I either recorded the wrong reading or because at low voltage the power pack was inaccurate and at high current there was a heating effect. However, as I mentioned in the analysing section, there was a simpler explanation. From previous work, I remembered copper is a very good conductor, therefore the high current reading. In future if I conduct another similar experiment to this one there are some improvements that could be made: I could compare my results with other people to see if they got the same or near enough results. That way I would know whether I was on the right tracks. If I am stuck on connecting the circuit, I could draw a diagram first and follow that. I should finish every experiment the same day; so that I get more accurate results and can compare the results to the results of another experiment, on the same subject and would not have waste time having to start the same experiment again. I could have done some further research and find out what and if there are any other factors that affect the resistance of a wire and then I could have conducted an experiment. ...read more.

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