Help with my physics course work, how does length affect the resistance of a wire?

Inni.x: Help with my physics course work, how does length affect the resistance of a wire?
I have done a piece of course work for physics, which is titled how does length affect the resistance of wire?
i have done the aim, method, collection of data, conclusion etc

now i need to do the evaluation, i have already commented on how i collected data safely, and the limitations. i have also wrote improvements. on my help sheet it says;

note the presence or absence of results that are beyond the range of experimental error

idk what that means! help :S
note the presence or absence of results that are beyond the range of experimental error<<<<<what does that mean?

Answers and Views:

Answer by a
r=v/i=c*d/a
c=constant

Answer by Midatlantian
When you do an experiment there is always some chance of error. Your ohm-meter cannot be 100% accurate. Perhaps it is very accurate, and has an inaccuracy of 0.01 % but it will never be perfect. There are all sorts of tiny variables, like the heat of the meter leads and the resistance of the wire in them. And so, whatever experiments you do will give you imperfect results.

So if I measure what I think will be a 100 ohm resistor and get 99.9, I will probably be satisfied. I would feel that my results were within the range of experimental error: my ‘set up’ was anyway not more accurate than that. If, however, I got one reading that said that it was a 32 ohm resistor, I would know that that was not just ‘experimental error’, not just a result of the little inaccuracies of all of the parts of my experiment. Then I would have a result that was beyond the range of my experimental error.

If you have not done statistics, and do not know how to calculate experimental error based on the degree of accuracy of each of the components in your experiments, then I would take this to be asking if any of the results seemed sort of wrong.. Otherwise, you should know how to proceed.

Answer by guru
If you mean the electrical resistance.
Then the electrical resistance is proportional to the length.
Double the length = double the resistance, for a given gauge.
Most electrical wires are made of copper. Copper has a positive resistance coefficient. The hotter, the more losses leading to thermal runaway!

The experimental error is the sum of all errors in the experiment. How accurate is each measurement.
For example if you have to mix some stuff, there is the scale accuracy, then the measurement accuracy…
Each instrument, electric, chemical…has its capabilities and limitations.

Hope this properly answers your question