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Factors which affect the Resistance of wires

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Introduction

Planning The problem that one is being faced with for this investigation is that of; "Factors which affect the Resistance of wires." The factors that affect the resistance of a piece of wire are: * Length * Diameter or thickness * Temperature * The type of metal. The variable I am going to do is the length of a piece of wire. The aim of my investigation is to investigate how length affects the resistance of a measure of wire. My background knowledge is as follows. * Resistance is the force, which opposes the electric current around a circuit so that energy is wasted 'pushing' the electrons around the circuit. * Resistance is measured in ohms. ...read more.

Middle

Consequently my prediction would be that; with the wire's length increasing the resistance will also increase, because the electrons will have a longer distance to travel and so more collisions will occur. Due to this, the length increase should be directly proportional to the resistance increase. To measure and record the results for this the results will be collected on a table. Length ( cm ) Volts ( V ) Current ( Amps (I) ) Resistance ( V/A ) 10 20 30 Etc... Equipment Three 9V cells, Ammeter, Voltmeter, A spool of 22 SWG, Nichrome Wire, Meter Rule, Two Crocodile Clips, Connecting Wires, Wire Cutters. ...read more.

Conclusion

To make this experiment a fair test the only thing that I'll be changing will be the wire length: The wire type (Nichrome), temperature, and diameter (22SWG) will be kept roughly the same. I will also keep the voltmeter, ammeter, and the cells the same. I will have to be careful when touching the wire, as it may be hot because the resisted energy will probably be turned into heat energy. A graph will be displayed to show the, hopeful, connection between the length of the wire and the resistance given by the wire. I will use the 10 points to mark on a graph, to see if my predicted result works, this will show in a certain pattern. ...read more.

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