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# How resistance varies with different lengths of wire.

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Introduction

How resistance varies with different lengths of wire The aim of my investigation is to find out how resistance varies with different lengths of wire. Firstly I will obtain a set of preliminary results. I will connect a circuit with a battery, variable resistor, ammeter, and length of wire with a voltmeter in parallel to it. The input variable I have chosen to change is the length of wire. I will measure the voltage for my results. From this I can work out the resistance FORMULA - R=V/I Prediction/ Science Knowledge: I think that the longer the length of wire the bigger the voltage needed because resistance occurs when the electron travelling along the wire collide with the ions of the wire. So if the length of the wire is longer, there would be more ions of the wire that the electrons would collide with, therefore you need a bugger voltage to push the current, and if the length of the wire is smaller vice versa. ...read more.

Middle

Then you can work out averages. Results cm Voltage Voltage Voltage Average Resistance 1 2 3 90 4.85 5.0 4.89 4.91 9.82 80 4.23 4.39 4.31 4.31 8.62 70 3.71 3.89 3.80 3.80 7.60 60 3.26 3.41 3.25 3.31 6.60 50 2.69 2.87 2.70 2.75 5.50 40 2.25 2.31 2.25 2.27 4.52 30 1.65 1.71 1.81 1.72 3.44 20 1.37 1.36 1.15 1.29 2.56 10 0.89 0.84 0.65 0.79 1.58 Safety: this is not a very dangerous experiment but despite this you must always handle electricity with care, keep the current low, handle with dry hands etc. Conclusion I think that from my results I can safely say that my prediction was right. The resistance did change in proportion to the length. This is because as the length of the wire increased the electrons that made up the current, had to travel through more of the fixed particles in the wire causing more collisions and therefore a higher resistance. ...read more.

Conclusion

Also I do not feel that the crocodile clips were always fixed securely to the wire with a good connection. This also meant that they were easy to move about on the wire changing the length of it. Errors rarely occurred in the setting of the current and the reading of the voltage. It was just in the preparation area that they did occur. Another example of this is the wire was never totally straight when we started the experiment, which may also, as said earlier on, effect the resistance of it. I do not think that doing any more results in our experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method - perhaps were we had a bar that did not bend in place of the wire. We could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit Aisha Farooq Resistance coursework ...read more.

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