Physics Coursework Gcse Resistance Wire

In my prediction I said that:”if the length increases than the resistance will also increase in proportion to the length”From my graph I have shown that my prediction was correct, as the Line of Best Fit is a straight line proving that the resistance of the wire is proportional to the length of the wire.

The length of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion.

so if the graph has the gradient then So yeah your results are not great Ah thank you I knew the gradient was the 0.8693 but since I got 2.2 which was way below the 4.9 standard I didn't think it was correct. I mean its almost a full straight line except a few points. The ammeter was really bad LOL What I don't get why its so low.

Ah thank you I knew the gradient was the 0.8693 but since I got 2.2 which was way below the 4.9 standard I didn't think it was correct. I mean its almost a full straight line except a few points. We had to measure the constantan wire at least at 3 different points and increase the voltage by 0.5 from 0.1m to 0.2 to 0.3m etc.

I don't understand what its asking me to do, calculate the resistivity of a specific length or just one? The gradient of that group would be resisitivity divided by area, and you just times by area to get resisitivty.

The Stolen Party Essays - Physics Coursework Gcse Resistance Wire

How do I work out the resistivity using the equations in the red boxes? Well you can work out the resisitivity from just one length of wire, but I think the idea is that because it's an experiment, you should do many lengths of wire, measure the resistance and plot the graph shown (R vs L).

The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material , so if there is a larger number of atoms there will be a larger number of collisions which will increase the resistance of the wire.

In this diagram the wire is half the length of the wire below and so has half the number of atoms, this means that the electrons will collide with the atoms half the amount of times.

From this list of factors I will only pick 2 factors to investigate.

Resistance occurs when the electrons traveling along the wire collide with the atoms of the material of the wire.