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# Resistance through wires.

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Introduction

Resistance through wires Introduction Electrical resistance is a measure of a materials opposition to the flow of an electric charge. Resistance is usually given the symbol 'R'. The unit for electrical resistance is the ohm. Ohm's law is the voltage drop (V) across a resistor proportional to the current running through it. The main causes of resistance to electrical flow in metal are imperfections impurities and temperature caused by the fact that electrons collide with the atoms creating heat. Aim: To find out how the length of a piece of wire affects the resistance. Variables Variable How I control it Material of wire Use the same material. Different materials have alternate atomic structures, conductivity i.e. inbuilt resistance, also some materials have more impurities than others. ...read more.

Middle

Conclusion My results show that changing the length of the wire affects the resistance. The Longer the wire is the higher the resistance, the shorter the wire the lower the resistance. What is happening in the wire is the electrons give some of their energy to the atoms and make them vibrate more causing the heating affect, also imperfection and impurities might not conduct electricity which will raise the resistance. Also I can see that resistance is constant by looking at my gradients, the gradients are all very similar throughout all my results, and I worked the resistance out by dividing resistance over the length. The reason that they are slightly different could have been because the wire did not cool down properly. ...read more.

Conclusion

I don't think taking my results too 3 decimal places would of made my results any more accurate because of the equipment I was using. I repeated my test twice and used a good range of lengths and I noticed a pattern in the results by looking at the gradients. If I could improve this experiment I would allow more time for the wire to cool because in my second set of results the gradient was slightly higher and I think this is due to the heating affect, try to attached wire to meter stick tighter to make the results more accurate and the length of the lead from the wire into the ammeter could of affected the resistance I would make it as short as I could to minimize the extra resistance it could add. ...read more.

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