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How does the length of a piece of wire affect the resistance?

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Introduction

How does the length of a piece of wire affect the resistance? Task: I am going to investigate the different resistances of the wire Constantan, at different lengths. Research: All conductors have some resistance, but long wires have more resistance than short wires, thin, wires have more resistance than thick wires. Nichrome wire has more resistance than copper wire of the same size. Resistance is calculated using this equation: Resistance= Voltage (V) Current (A) The unit of resistance is the Ohm (?). The higher the resistance the less the current flows for each volt across the wire. The dependant variable in our experiment is the resistance, since the investigation is what " what resistance does a wire have?" We will measure the resistance with a voltmeter and an ammeter. Many factors or variables could have an effect on the dependant variable, they are listed below: * The thickness of the wire * The length * The type/material of the wire * The temperature * The current I am going to measure the variable of length. This is the circuit I will be using: I will do a set of preliminary results to see whether the experiment will work. ...read more.

Middle

As the resistance in a wire increases, the current decreases. Apparatus: 100cm rule, 100cm of wire, Connecting leads with crocodile clips, Power pack - 12volts, Voltmeter, Ammeter, Micrometer I used a digital ammeter and voltmeter to ensure that I got accurate results, as it is harder to read an acoustic one. The 100cm of wire was connected to both ends of the 100cm rule, so I was able to choose where the crocodile clips where placed. I used a 12-volt power pack Method: I have done some preliminary work so I understand the experiment fully. From my preliminary work, I have found that the more wire there is, the more resistance there is. My results prove this. In my preliminary work I blew the fuse several times, so it was necessary for me to place something else in the circuit, I decided to put ion a light bulb, as this would be enough to increase the resistance. After setting up the apparatus set the power pack to 12volts, place a crocodile clip on the wire, and another one 5cm away, turn the power pack on, and take the readings from the voltmeter and the ammeter. Record these, and then repeat the experiment twice again. ...read more.

Conclusion

using excel drew up the results and a graph: Graphs for my original results can also be seen overleaf : Conclusion My results tell me that the shorter the wire the less the resistance will be. As the length of the wire is increased the resistance increases. This is shown by these results: Ave Resistance (?) 0.38 0.76 1.00 1.31 1.68 1.92 2.37 2.67 3.14 3.52 This shows the resistance increasing as the length of the wire increases. The reason the resistance increases is because there is more space for the atoms to clash; if the wire were thicker the resistance would be even higher. If the voltage was increased the resistance would be higher, as there are more atoms to clash with. Evaluation I think my procedure was useful, as I have followed the method carefully. I have used the correct equipment and I have measured everything accurately. I wouldn't make any changes to my method I would increase the thickness of the wire so the resistance would be higher. My data was accurate because I have followed my method accurately. I don't have any anomalous results. If I could do the experiment again, I would change the thickness and the length. I wouldn't need any extra equipment to conduct this experiment. - 1 - ...read more.

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