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Investigate what effects the resistance of a wire.

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Introduction

Resistance Aim To investigate what effects the resistance of a wire. Method We are going to set up two circuits, to test what effects the resistance of a wire. We will use a battery, a variable resistor, a voltmeter, an ammeter, and a wire. The wire will be of a different material for each of the circuits and we will vary the length of the wires. We will record our results measuring the volts, current, and then finally calculate the resistance. Plan Variables Change Unchanged Measure Volts Amps Resistance Wire Width Length Material Uniform For this experiment we are going to use a Eureka wire and a Constantan wire, they will both have the same thickness of 0.56 mm. For each of the two wires I will measure the wire at 10cm intervals from 10cm to 100cm. I will measure the current (amps), potential difference (volts), and then calculate the resistance. From scientific knowledge I know that the temperature of the wire affects the resistance, therefore to prevent this from happening I will turn off the power supply in between recording the results. ...read more.

Middle

you divide the p.d by the current Conclusion My results clearly show that as the length of the wire increased, the resistance also increased. This agrees with my prediction, as I stated that as the length increased it would require more energy to move the electrons through the wire. This has proven to be correct. These results also tie in to the scientific theory, as it is known that length affects the resistance of a wire. We also tested another material as part of our investigation to see if this also affected the resistance of the wire. We used a wire called constantan shown on the results table in black, and a wire called eureka shown in blue. As the table shows there wasn't a great difference between the two wires. The constantan wire had a slightly higher resistance but only by a small amount. Therefore this evidence is not really substantial enough to prove which of the wires affected resistance the greatest. ...read more.

Conclusion

There were only a couple of problems with our investigation that we were able to notice and improve without them ruining the results. To begin with we were keeping the power to our circuit on throughout the experiment, this was allowing our wires to get over heated and ruin the results. We noticed as the wire was burning through the selotape that we had used to stick it to the ruler. We then turned off the power and repeated the results that were incorrect. Another problem was that the wires we were using were too bent, which meant that it wouldn't have been a fair test as the length wouldn't have been correct. Again we repeated the incorrect results with a fresh piece of wire. If I were to repeat this investigation I would make it more reliable by timing how long the power was kept on for to ensure that the wires never exceeded a certain temperature. I would also take more readings to see if the difference in resistance between the two different materials continued to increase, this would help me to decide whether the material did affect the resistance of a wire. By Carla Hodgkins ...read more.

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