INTRODUCTION: In this coursework investigation, I will be doing a series of experiments to see how changing the length of a piece of wire affects the resistance of the wire. PREDICTION & BACKGROUND THEORY: I predict that as the length of wire becomes longer, the resistance will become gradually bigger. A piece of wire is made up of several hundred atoms. An electrical flow is able to run through the wire, these are e- electrons. As the current increases the velocity of the e- electrons increases which increases the amount of collisions between the electrons and...
as "we left the power on too long and caused overheating" or "we simply took a mis-reading". However, this does not happen for the majority of the readings so we have an adequate set of results to draw this conclusion.

The results could be changed if we did things differently a second time around:

- Changed current

- Used different wire

- Left the power on for longer

Our prediction has been proved correct. As the length of wire increases the resistance gets bigger. They are proportional to each other in this case.