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5) The globe's graph is not a straight line due to the high amount of heat generated by the filament in the globe. Of course this is visible to some extent in the readings of the 4 other resistors, but the light globes gives up a lot of heat. This heat causes the atoms  to move more, which in turn means that the electrons have a harder time trying to get through the media, jumpine medium to find it hard to move through the medium.