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To investigate the effect of changing physical properties has on the resistance of a piece of wire.

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Introduction

Aim: To investigate the effect of changing physical properties has on the resistance of a piece of wire. Variables: The variables are: Temperature Length of wire Diameter of wire (cross sectional area) Material of wire These will all affect the resistance of the wire. The temperature will affect the resistance of the wire because as the temperature of the wire increases the metal will expand. This will affect the diameter and length of the wire. Also as the wire gets hotter the static particles get more energy and so vibrate more. This causes the average space they take up to increase and so there is a greater chance of a collision between them and an electron. The length of the wire will affect the result because if the wire is longer there are more particles for the flowing electrons to collide with, which in turn slows down the electrons and so the resistance is greater. They slow down because at each collision some kinetic energy is transferred into heat energy. The diameter of the wire will affect the result in the opposite way as the length. ...read more.

Middle

* I will not hold the contacts down for more than 5 seconds to prevent the wire becoming hot and affecting the result. * Repeat the tests using the same amount of force so my results are accurate. * As I complete each test I will add the information to a sketch graph so I can spot any anomalous results quickly allowing me to repeat that test. Apparatus: Power pack Connecting Leads Amp meter Voltmeter Wire to be tested This apparatus will be set up as shown in the second diagram. Results: Length of wire (mm) Voltage setting (v) Test A Test B Test C Average resistance () V I V I V I 100 2 1.10 3.30 0.333 1.10 3.31 3.332 1.08 3.40 0.318 0.328 200 2 1.40 2.23 0.627 1.41 2.17 0.650 1.42 2.25 0.631 0.636 300 2 1.58 1.75 0.903 1.58 1.73 0.913 1.58 1.72 0.919 0.912 400 2 1.67 1.40 1.193 1.68 1.40 1.200 1.69 1.39 1.218 1.204 500 2 1.75 1.15 1.522 1.78 1.17 1.521 1.76 1.16 1.517 1.520 600 2 1.82 1.01 1.802 1.82 1.01 1.802 1.82 1.01 1.802 1.802 I found the resistance by using Ohm's Law of: Resistance = Voltage ----------------------------- Current Analysis: To display the information in a way I could analyse the results I put them into a graph. ...read more.

Conclusion

My results also support Ohms law. The method I used could have been improved by doing many things. First I could eliminate the variable of how hard I pushed down on the wire by wising crocodile clips, to maintain a constant pressure, and have a switch to turn the circuit on and off. I could also remove the heating effect by adding a variable resistor to the circuit. By adjusting the variable resistor for each length of wire, the current could remain constant and so the heating effect is exactly the same for each test, which makes it fair. The range of reading I took could be improved by making the range more concise. This would allow more points on a graph and so a better conclusion. For additional evidence the experiment could be extended to include the testing of much longer pieces of wire (1-6 meters) or to investigate the cross sectional area of a wire. Also we know how one metal reacts and what its resistance is but different metals may react differently. My experiment supports Georg Simon Ohm's theory of resistance. Science AT1 Resistance of a Wire By Kieran Wood Kieran Wood Resistance of a wire Experiment 2001-09-04 Mr Hodgson ...read more.

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