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To find the relationship between the length of the wire and the resistance it gives.

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Introduction

What affects the resistance of a wire? Aim: To find the relationship between the length of the wire and the resistance it gives. Introduction: I am going to carry out an investigation to discover what the relationship between the length of wire and resistance is. I will take into consideration that there are other factors that could affect this. These are, the thickness of the wire, the type of wire as well as the temperature of the wire. Method: This is a diagram of the circuit I will use to carry out the experiment: I am going to use this circuit to measure the volts of the circuit using a volt meter which reads to 3dp to make my readings more accurate. I will measure the amps of the circuit using an ammeter which reads up to 3dp to make my readings more accurate as there will be less room for error. I will keep the thickness of the wire the same, I will keep the material of the wire the same and I will try to keep the temperature of the wire the same. I will do this as all these factors may have an effect on my results. I will also use the same batteries for the reason I used above. The only input variable I will change will be the length of the wire as this is what I am going to investigate. ...read more.

Middle

After carrying out this experiment, I discovered that the resistance was very close to each other, mainly going up by a small amount however in one case this did not happen, the resistance went up but for the next two readings they went back down before going back up again. Because of this, I have decided to use a variable resistor to make it possible for me to carry out the experiment five times on each length of wire, therefore making it possible for me to work out an average and improving my experiment overall. Here is a diagram of my new circuit I will use for this experiment: While carrying out this experiment there will be no potential safety hazards. Prediction: I predict that the longer the wire the greater the resistance. I predict this because there will be more atoms for the travelling electrons to collide with therefore there will be more electrical resistance. The electrons are negative charges which are sent around the circuit. These charger are measured in bundles of 6 million million million called coulombs. When working out the resistance of a circuit you use the potential difference and current. This will tell you how difficult it is for current to flow through the circuit. As the wire is longer, there will be more atoms making up the wire waiting to collide with the electrons travelling in the current therefore creating more resistance. ...read more.

Conclusion

The result which I feel may have been causing this problem was the result which read 7.428571429. Therefore, I should have ignored this result when calculating the resistance for this reading. This was one mistake I made. I feel that my line of best fit is the only way of drawing the line of best fit. I feel this as my results are more or less in a straight line, showing a straight line graph. There is no other obvious way of drawing the line. My results were very reliable, if someone was to repeat this experiment with the same equipment, their results should not be much different to mine. This is because the experiment was a straight forward experiment and there is nothing that could really go wrong. Improvements that I could make to this experiment are I could as I planned use appliances (volt meters and ammeters) which read to three decimal places to prevent rounding errors even more. You could also obtain more results but the accuracy of my results are that as such that this should not make much difference i.e. they are very accurate. Overall I feel my experiment was very successful. [H1]From here on I will not take account of the last two readings as they are too small a current and there will be more room for rounding errors. By Hannah Ridley ...read more.

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