couldxbe (couldxbe) wrote in gcsesciencehelp,

Physics: Resistance proportional to length of wire

Hey guys!
In Physics we're doing an experiment to see how the resistance changes with length, but I'm having extreme difficulty in the experiment: even the preliminary work!
For example, how many lengths do I need? How can I keep the current and voltage the same for each length? Everything like that. I've been off recently due to an illness and my teacher is refusing to explain it to me!
Finally, I know that as the length increases so does the resistance, but I've no idea of the "scientific knowledge" behind it!
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I'm assuming this is Physics Coursework with all the background knowledge etc.

For number of lengths try ten (gives a good graph) and 1/2 repeats dependant on time

You can keep the same voltage by using a power pack and setting it always to the same point (check with a voltmeter)

As the length increases the resistance increases because the amount of "stuff" through which the electricity is flowing increases.

-Actually this experiment is usually explained in detail in the back of text books. I know I haven't been particularly forthcoming in the background knowledge but being coursework I'm loath to go too far beyond the boundry of help.