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# Investigation of how the Length of Wire affects its Resistance.

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Introduction

Investigation of how the Length of Wire affects its Resistance Planning Prediction I expect that the longer the wire is the higher the resistance will be. I predict this because in our preliminary experiment the length of wire affected the resistance. We discovered the longer the wire the further the current needs to travel and this cause's higher resistance. This is because of the more atoms the current needs to pass. With there being more atoms there are many collisions and this is the source of resistance over length. Equipment * Resistance Board * Power Supply (4V) * Ammeter (2A) * Voltmeter (6V) * 5 constantan wires Method I will create a circuit as seen here containing a resistance board, four volt power supply, ammeter and voltmeter. Next I'll measure out points along the Resistance Board at 5cm intervals, connect one lead to one lead of the board and the other at the first 5cm interval. ...read more.

Middle

I'll keep the temperature, thickness and material the wire is made of the same. We carried out an experiment to determine which factors affect the size of resistance. We discovered the longer and thinner the wire the higher the resistance. Also using Nichrome wire instead of constantan increases the resistance. I will be keeping all other factors apart from length the same to establish the relationship between length of wire and change in resistance. I could also investigate these other factors: the temperature, material and thickness. But we have chosen length to measure because it is the easiest to create many variables for and so we get a larger scope of results. I will make 10 measurements each 5cm apart; this will give me 10 different results. I will repeat the whole experiment to give me two sets of results; I'll then take an average from the two sets of resistance results and plot a graph with those. ...read more.

Conclusion

These results as supportive of my prediction, and confirm my guesses of the outcome of this investigation. Evaluation The method I used worked well and was easy to use to get the results I wanted. A problem I encountered when using a very short length of wire was that the resistance was so low that wire's temperature rose very high because of this it was dangerous as well as difficult to try and get a result for the 5cm readings. The results that I obtained during the investigation were fairly accurate for the equipment I was using. The difference between the first and second sets of results was worrying, but it levelled out and when I took an average it seemed okay. I could have used a more a accurate voltmeter and ammeter with a more precise scale due to some measurements being very close together, between two figures. If I was to repeat the experiment I would use a different material of wire which may cope better with low resistances and not heat up to rapidly. Jamie Willis ...read more.

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