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Investigation on how a length of a wire affects the resistance in a current.

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Introduction

GCSE Physics Coursework Year 11 Craig Lochhead Investigation on how a length of a wire affects the resistance in a current Aim The aim of this investigation is to show how the length of a constantan wire will affect the resistance of the current going through the wire. Prediction I would think that when the length of the wire increases the resistance in current will increase as well. I think that the increase of the resistance is directly proportional to the length of the wire. Background Information The meaning of resistance in a circuit is how much a voltage is needed to push a current through a wire. There are factors that affect the rate of resistance of a current. These factors are length of wire, area of a wire (diameter), material used and temperature. The cross-sectional area of a wire can affect the rate of resistance. As a wire in area increases the resistance decreases. This is because there is more space for the current to go through. The material used can also affect the rate of resistance in a current going through a wire. The material used for the least resistance is Copper. This is because there is a lot of space in between the atoms of the metal, making it easier for the current to pass through. ...read more.

Middle

* Readings are then taken when the length of the constantan wire is at 10cm, 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, and 100cm. Using the results gathered from this experiment, the resistance of the specific length of wire can then be calculated. Resistance and be calculated using Ohm's Law, which is shown below. V= I x R or Voltage (Volts) = Current (Amps) x Resistance (Ohms) Fair Test Since there are four other types of factors that can affect the rate of resistance, these parameters in the experiment should be set up carefully so that it does not affect the rate of resistance. In this experiment the length of the wire will change from 0 to 100 and it should be made so that the length required for the results are accurately measured. All other factors of resistivity must not be changed as they will affect the rate of resistance. I must make sure that the voltage and the current of the wire must not be changed either as this can affect the rate of resistance as well. Room temperature must remain constant as well. Results Table Length of Wire 1 2 3 Average Resistance (cm) V I V I V I V I (ohms) ...read more.

Conclusion

Evaluation In the graph I have shown there is only one anomalous result, this could just mean that I have done a simple mistake while measuring the lengths required. Although I think this result is anomalous it is not far of the line of best fit. To improve my results a bit more to make it more reliable I could make more testing so that my average is better. Even though the wire should be at the same diameter at all points, there still could be different diameters to some areas that could affect the results I had. Another factor that could have changed or did change my results is when I measured the wire and put in place as the wire was bent and I didn't straighten it. Also the wire was not properly placed on the ruler as it was only celotaped on. I could also have expanded my investigation further by testing the other parameters involved in this investigation. I could have tested different type of materials to find out what resistance went through them at a constant length. This would be done to see which material had the least resistance and the most resistance. I could have also tested the different diameters using the same metal to test how resistance is affected when using different lengths. ...read more.

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