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A.S. Physics Practical Coursework Resistance of Nichrome Wire

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Introduction

AS PHYSICS PRACTICAL COURSEWORK RESISTANCE OF NICHROME WIRE PLANNING: The experiment that I am going to carry out involves largely aspects to do with resistance. In this particular experiment I will test how the resistance varies across a piece of nichrome metal wire over a range of distances. I will try to find out if there is a relationship between resistance and length. To determine whether or not there is a relationship between the length of a wire and the resistance, I will measure the current flowing through different lengths with a certain voltage and work out the resistance using R=V/I. I will also attempt to find a relationship between resistance and thickness. I believe that this will result in a straight line as well because R?1/A. So, as thickness increases resistance should decrease, as the electrons should be able to flow more easily. Therefore, current should increase with increasing thickness. WHAT I WILL DO The ammeter and voltmeter will be connected to a power supply. The crocodile clips will be connected to the voltmeter. Then I will place the chrome wire on a ruler and secure it with masking tape. Then I will place the clips at different lengths. I will do this about 10 times for one thickness in this case I have chosen 0.21mm. ...read more.

Middle

* I will connect the leads with the power supply, clips, voltmeter & ammeter. * Also, I need to ensure that none of the connections are loose; this is to ensure safety. * After, the connection checks have been carried out; I will begin to set-up the experiment. While proceeding with the set-up I will have to make certain that the leads do not cross each other. Therefore, the leads will be placed neatly. * Cut slightly over desired length of wire. * Place it on top of ruler and secure it by placing masking tape over the wire and ruler. Tape should be stuck on away from the desired points where the clips will be. * Place clips at two points from the greatest distance and decrease length after each experiment i.e.: 100cm, then 90cm....10cm. * Calibrate power supply to 0.5 Volts. Then activate the power supply after the clips have been placed on the points. * Measure the voltage and current at each length. * Deactivate power supply after each reading. * Record readings and calculate resistance using R = V/I plot graph. * Plot resistance against 1/A to show that R?1/A. 1/A means 1 divided by the thickness for e.g.: 0.19mm. ...read more.

Conclusion

Though I do not believe it will affect my results too much. Reliability will affect my results slightly. Coming back to the time factor because of the limited time I may rush things, which may affect accuracy. When I place the clips on the wire I may not place them exactly in there accurate positions give or take 0.2cm. This will affect the results slightly. The apparatus I will be using is frequently used so, there is a possibility that for e.g.: the ammeter may not read the value of the current accurately but it probably won't be by much. I have thought of ways to tackle these problems as best as I can. The only factor I can't change is time. To make my results as accurate as possible I will make sure voltage from the power supply is constant, which I have decided will be 0.5V. So, that I have as accurate results as possible I will repeat results so, for e.g.: the placing of clips can be accounted for and this way it shouldn't affect the results tremendously. To avoid damage to the part of the wire, which I will be placing the clips on I will cut the wire longer than necessary. I will check if the ammeter and voltmeter are as accurate as possible by putting through a certain voltage {from a power supply} and see on the LCD screen if it measures accurately. ...read more.

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