The length and resistance essay
Turn on the power pack and wait for the ammeter and voltmeter to settle.
How the length of a wire affects the resistance
I have, however, drawn two different lines of best fit, because my results from wire lengths of cm to cm are such a big 'jump' away from my other results, that I believe that, as we recorded the two sets of results 20cmcm and cmcm on different days, we performed the experiment with the longer lengths of wire on the wrong voltage, a higher voltage than 2v. The aim is to find the effect of the length and area of wires on their resistance. They showed me how the relationship between the length of a wire and its resistance is directly proportional. The longer the wire, the longer the electrons have to stay squashed together, and so the longer they take to pass through the wire and the higher the resistance. To improve this, I would take the measurements spread out, ie , , , , rather than , , , , , and so on. I also believe that the rate at which the resistance of the wire increases will be directly proportional to the length. Type of wire is a discreet variable, so I could not identify a proportional relationship, meaning no line graph in my conclusion.
Resistance: Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire To improve this, I would cut each length of wire slightly longer than needed, and then mark to show the length, so the crocodile clips could be placed on at exactly the right length. My measurements were fairly accurate because I recorded them to two decimal places, however, I feel that they could be made more accurate by using a fine pointer instead of crocodile clips to connect the leads to the wire, because when using crocodile clips it is hard to be sure that you are taking the readings from a length of exactly 80cm, or cm, or whatever the length of wire to be tested is.
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As I neared the end of the experiment, me and my team may have rushed the setup and measurements more, meaning less accurate results. Then I put the other crocodile clip on the piece of wire that read 10 cm on the ruler. Either of these would ensure that all three measurements were the same, and as accurate as possible.
It is measured in ohms?
Alternatively, I could use an ohmmeter, which measures the resistance directly. Due to this, the length increase should be directly proportional to the increase in resistance.
How does the resistance of a wire vary with its length
In my method, the main inaccuracy was the length of the wire. Either of these would ensure that all three measurements were the same, and as accurate as possible. The means the electrons collide with each other more, transferring and therefore losing more of their own energy, so less electricity is passed through. The current of my circuit decreased slightly each time the length increased. They showed me how the relationship between the length of a wire and its resistance is directly proportional. The second main inaccuracy was that, when I clipped my wire into the circuit, the crocodile clips might not have been at the very end of the wire. The resisting wire is like a smaller tunnel for the electrons to pass through. Waiting for the reading to settle will prevent accidentally taking a reading while the value is fluctuating randomly when the power is first turned on. This is because it will take longer for them to pass from one side of the wire to the other side. This would improve the accuracy of my results.
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