Physics Coursework Gcse Resistance Wire

Physics Coursework Gcse Resistance Wire-28
I will do this by going through all of the factors that affect the resistance of a wire and how I would measure each factor to find out which would be the most effective and easiest factor to measure.

The number of electrons depends on the amount of electrons in the outer energy shell of the atoms, if there are more or larger atoms then there must be more electrons available.

If the material has a high number of atoms there will be a high number of electrons causing a lower resistance because of the increase in the number of electrons.

The word 'ideal' is another way of saying the conductor follows Ohms law without needing to invoke thermal considerations or any other parameter which would cause a deviation form Ohms law such as inductance, capacitance etc.

Before starting my coursework I have decided to choose 2 factors that will affect the resistance of a wire.

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. 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. 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).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.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.How do I work out the resistivity using the equations in the red boxes? so if the graph has the gradient then So yeah your results are not great I'm not sure what you're doing above but you're given what you have measured is Length and Resistance.I don't understand what its asking me to do, calculate the resistivity of a specific length or just one? So you can rewrite the equation This is in the form of the straight line you have plotted in your graph which has a gradient of 0.8693. The ammeter was really bad LOL What I don't get why its so low.Yeah maybe but that comes with the poor ammeter / voltmeter that our college has - it was *slightly* flickering when recording results. I'm not sure what you're doing above but you're given what you have measured is Length and Resistance.Normally, industry equipment would have more accurate results, hence why its not a perfect straight line graph lmao BUT at least I can talk about that in my conclusion/evaluation. So you can rewrite the equation This is in the form of the straight line you have plotted in your graph which has a gradient of 0.8693.

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