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Physics Coursework Plan: The Resistance of a Wire

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Introduction

Physics Coursework Plan The Resistance of a Wire I will be measuring resistance of a wire in two ways. In all procedures I will use different thickness, length and material of wire. This should show if the resistance differs due to any of these variables. Also both experiments will be repeated to try to rule out any anomalies that might occur. There is only a subtle difference between the two experiments, and that is that the equipment used to collect the evidence will be different. For the first experiment I shall use an ammeter to measure the current through the wire in current and a voltmeter to find the voltage across the wire. ...read more.

Middle

A multimeter that measures volts, amps and ohms as well as other units will be used and will be set to the appropriate mode to measure the right unit and scale. A voltmeter will be connected in parallel to the wire so that it can measure the voltage effectively. The ammeter will be placed in series before the wire so that it also will measure effectively. Next is the wire itself. The wire will be measured at different length so I have chosen to use a scale of 2 - 20cm in length, as I believe that if the wire is too long or short the results will not be accurate. ...read more.

Conclusion

The resistance is proportional to the length of the wire so if the length of the wire doubles the resistance should double. Even so at constant voltage, less energy is free to the electrons to move through the wire so the electrons move more slowly around the circuit. Therefore the resistance will get higher. The temperature can affect the resistance because when a material reaches a certain temperature called its critical temperature the material no longer gives any resistance to the electrical flow. The width of the wire can also change the resistance. This is because there are more free electrons and less energy can be given to the electrons through each centimetre of wire. In turn the electrons move slower around the circuit causing the resistance to rise. ...read more.

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