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# Resistance of Constantan wire investigation.

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Introduction

Resistance of Constantan wire investigation Prediction In electricity, the property that changes electrical energy into heat energy, in opposing electrical current, is resistance. Something that atoms of all conductors have in common is that they have free electrons in the outer shell of their structure. As a result of the structure, in all conductive atoms, the outer electrons are able to move about freely, even in a solid (in this case, the constantan wire). Electrical current is formed when there is a voltage across a conductive material and all of the free electrons arrange themselves in lines, moving in the same direction. Resistance comes across when the charged particles that make up current collide with other particles in the material. As the resistance of a material increases, so does the force required to drive the same amount of current. ...read more.

Middle

I will take each reading three times and use the average ammeter reading for my graph. 4. I will also record the voltmeter reading to make sure it is always the same throughout the experiment. Results Length of Constantan wire (cm) Current (amps) 1st Reading Current (amps) 2nd Reading Current (amps) 3rd Reading Current (amps) Average Reading Voltage (volts) 5 4.73 4.80 4.82 4.78 6.1 10 3.61 3.63 3.64 3.63 6.1 15 3.03 3.03 3.03 3.03 6.1 20 2.58 2.58 2.59 2.58 6.1 25 2.24 2.22 2.25 2.24 6.1 30 1.99 1.99 1.99 1.99 6.1 35 1.63 1.64 1.64 1.64 6.1 40 1.49 1.49 1.50 1.49 6.1 45 1.38 1.38 1.38 1.38 6.1 50 1.28 1.28 1.28 1.28 6.1 Analysis of results and conclusion I can see a pattern in my results, it is very clear in the graph. ...read more.

Conclusion

It is probably because of these precautions that I didn't get a result that looked out of place. I think I could have improved this experiment by changing the constantan wire for each length. I think this would improve my results because I know that the resistance of something can depend on its heat. So if I use the same 1m wire for the 5cm and 10cm tests, the results will not be as accurate as they would be if I had used completely different wires. This is because when I used the same length of wire for doing the 10cm test as I did for the 5cm one, half of the wire was quite hot and I think this would alter the resistance. But I think this would only make a small change to my results. Overall I think that my experiment was successful and I have proved my prediction. ...read more.

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