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Investigating the Resistance of wire.

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Introduction

Investigating the Resistance of wire. Prediction: I predict that if the length increases then the resistance will also increase in proportion to the length. Hypothesis: my predication is based upon the fact that the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the length is doubled the resistance should also double. This is because if the length is doubled the number of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance. My graph should show that the length is proportional to the resistance. ...read more.

Middle

From my graph I have shown that my prediction was correct, as the Line of Best Fit is a straight line proving that the resistance of the wire is proportional to the length of the wire. The length of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion. The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material , so if there is a larger number of atoms there will be a larger number of collisions which will increase the resistance of the wire. ...read more.

Conclusion

Also if the length of the wire was trebled or quadrupled then the resistance would also treble or quadruple. Evaluation: From my results table and graph I can see that my results that I collected are very reliable. I know this because my results table does not show any individual anomalous results this means that I did not have to leave any results out of my averages because they were anomalous. Also on the graph I can see that none of the averages plotted are anomalous because all the averages lie along the same straight line. If I was to carry out the investigation again I cannot think of any improvements that I could make to get better results as the results that I got were very accurate. ...read more.

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