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# An Investigation into the Factors Effecting the Resistance of a Wire

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Introduction

An Investigation into the Factors Effecting the Resistance of a Wire Aims: The variables that effect the resistance of a wire are length of the wire, thickness of the wire, temperature and the type of wire. In these experiments I am going to be investigating the length and thickness of the wire against the resistance. Experiment 1 To investigate the effect of length of wire on resistance. Prediction I predict that the longer the wire the more resistance there will be. This is because the longer the wire the more atoms will be present. The electrons passing through the wire will have to collide with more atoms, in turn creating more resistance. The amount of the resistance should be in proportion to the length of the wire. ...read more.

Middle

I will use these readings to calculate the resistance. The unit of resistance is the Ohm and I will use Ohms law V = R I Diagram A This shows an ammeter A and a voltmeter V and connected to find the value of resistance Results This table shows the affect of length of wire on voltage, current and resistance. The resistance was calculated as follows: V = R 0.86 = 0.71 I 1.21 Length Voltage (V) Current (A) Resistance (Ohms) 10cm 0.86 1.21 0.71 20cm 1.24 0.87 1.43 30cm 1.48 0.68 2.18 40cm 1.58 0.55 2.87 50cm 1.68 0.47 3.57 60cm 1.82 0.42 4.33 70cm 1.86 0.37 5.02 80cm 1.90 0.33 5.76 90cm 1.90 0.31 6.39 100cm 2.00 0.28 7.14 I put these results on to a graph and filled in the line of best fit (see graph A) ...read more.

Conclusion

It is very difficult to measure the wire accurately using a ruler and to be certain that the wire is completely straight. The graph shows one slight anomaly at 90cms. Using the line of best fit I would expect the result to have been 6.50Ohms instead of 6.39Ohms. This may have been due again to inaccurate measurements of the wire or the crocodile clip may have been placed incorrectly causing poor contact. Also this anomaly could have been due to a change in temperature of the wire, possibly due to a pause in the experiment leaving the wire to cool. If I were to do this experiment again I would try to use more accurate forms of measurement and take greater care when ensuring that the wire is completely straight when secured. Also, taking readings every 5cms would make my results more detailed and perhaps explain the anomaly better. CHLOE MCGEOWN 11D PHYSICS COURSEWORK MR HOGG ...read more.

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