Investigating the Resistance of wire.

The diagrams below show my prediction and should explain it more clearly:

Because the length of the wire is only half the length of the wire below there should be half the number of collisions between the electrons and the atoms. The wire below is twice the length of the wire above and so there should be twice the number of atoms resulting in twice as many collisions and a predicted doubling of the resistance.

Plan:

Results:

Conclusion: In my prediction I said that if the length increases than the resistance would also increase in proportion to the length. 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. If a length of a wire contains a certain number of atoms when that length is increased the number of atoms will also increase. This is shown in my diagrams below:

In this diagram the wire is half the length of the wire below and so has half the number of atoms, this means that the electrons will collide with the atoms half the amount of times.
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.