Hi, does ne1 know nething about resistance? I'm doing coursework and need to know why the resistance changes with the length. I've done the experimenty thing, and wrote a bit about sum sort of electron theory, but am now stuck. It appears i have to 'Use scientific knowledge and understanding to plan and communicate a procedure, to identify key factors to vary, control, or take into account, and to make a predictiom where appropriate'.....whateva that means.
Any help would be great, thanx.