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# Investigating how theThe Length Of A Wire Affects Its Resistance.

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Introduction

INTRODUCTION In this experiment, I will investigate how the length of the wire affects its resistance. Atoms are situated in a wire and the electrons carrying the current are free to move. The fixed atoms cause the resistance in the wire as the electrons move around the circuit. So the longer the wire the more atoms in the path as obstacles for the electrons and this experiment will investigate how great the affect of this is. Temperature will also be decisive factor affecting the resistance of the wire. As the wire heats up the atoms will oscillate about a fixed point, which cause even more obstruction as the electrons flow around the circuit. I will attempt to keep the temperature the same by ensuring the current flows for a minimal amount of time. APPARATUS * Power pack * Ammeter * Variable resister * voltmeter * 100cm Test wire * Connecting wires * Crocodile clips PREDICTION I predict that the length of the wire will have quite a big effect on its resistance. ...read more.

Middle

Ensure the current is the same throughout the experiment by using the variable resister. Disconnect test wire and cut by 10cm down to 90cm and then reconnect the test wire and repeat the test twice. Cut the wire each time by 10cm with the last test being with the wire at a length of 10cm. > Ensure current remains the same throughout the experiment. SAFETY * The current should be kept flowing for a minimal amount of time as the wire will get hot * There is a safety switch on the power pack which will not allow the current to flow above 5amps PRELIMINARY RESULTS In my preliminary experiment, I tested 3 wires of different thickness I tested them each at 100cm and at 10cm. by doing this and finding the resistance I would be able to choose the most relevant wire, which be the wire that had the most varied results. ...read more.

Conclusion

The current was kept constant throughout the experiment and it was the voltage that changed due to the length of the wire, so as the voltage became smaller the resistance decreased. EVALUATION From my results, it can be seen that they followed the pattern that as the length of the wire shortens the resistance decreases and has therefore followed my prediction of this. I feel that my results were accurate as I haven't collected any anomalous data and my results have followed my predicted pattern and also my results pursue a line of best fit on my graph. I believe also that my results are reliable as I have tested each length of wire twice, I ensured the current remained constant and I also kept the temperature of the wire at a minimum so to not dramatically hinder my results, so on he basis of this I consider my results to be fairly accurate. ...read more.

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