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Resistance Investigation

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My aim is to find out when I increase a length of wire there should be more resistance in a circuit.

Everything on earth is made up of Atoms, which are at a great mass and with a positively charged nucleus. The atom is made up of protons in which is made up of fundamental partial called quarks so the proton have three quarks and they are two going up and one going down and neutrons is also made up of quarks but arranged in a the opposite way they have two going down and one going up. Both protons and neutrons should be about the same mass in the Central nucleus surrounded by Electron.

The nucleus is surrounded by a number of moving electrons, each of which has a negative charge equal to the positive charge on a proton. In a neutral atom, the same number of electrons surrounds the nucleus as it contains protons. The region of space in which an electron is most likely to be found is called an orbital. The chemical properties of an element are determined by the ease with which its atoms can gain or lose electrons from its outer orbital.image01.png

Metals are good conductors of electricity. They good conductors of electricity because there atoms lose some of there electrons quite easily. In a piece of metal, the atom are packed together in a regular pattern this is called the lattice.

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        V           = I           X        R

Resistance is measured in units called ohms. The symbol of is 88.a resistance of one-ohm carries a current of one ampere if there is a potential difference of one volt across it.

     You can work out the resistance of a conductor by measuring voltage and current and then rearranging the equation above to-




Some metal are flexible they can be twisted in to wire. It is likely that the wire making process cause the faults in the crystal lattice. This means that the faults are probably evenly spread along the wire so longer the wire there would have to be more resistance. As long as the type of wire is not change or in diameter it would be fair. So I predict that if we increase the length of wire there would be more resistance.



      15CM                        1.00                0.68                1.47

      30CM                        1.00                0.31                        3.22

      45CM                        1.00                0.76                1.31



The experiment I will be doing is to find out the amount of resistance there would be in an x length of wire.

I will do this by:

  • Connecting the whole circuit up above
  • Then cut out a 15cm piece of Constantan wire and put it in to the circuit.
  • Then measure the current and the voltage.
  • And do this for the 30cm piece of wire and the 45cm piece of wire.
  • And do the whole thing again to get three pieces of results.
  • And then find the average amount of resistance in a 15cm,30cmand 45cm piece of wire and show it on a graph.
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My result fits perfectly with my prediction, which was if we increase the length of wire there would be more resistance.

I think this is a good to test out my prediction as we can find the voltage and the current to find out the resistance. In the end in think we could of collected more results to make your sample a little bigger and the results would be more reliable but the good thing was that I collected my results accurately but the graph shows us that the 30cm average was a little iffy because it didn’t come in to the line on the line of best fit. I am not calling it anomalies. My information is reliable because when you increase the length of the wire there is going to be more cracks along the wire and the electrons would not bounce off it.

We can do some further work that we can carry out to provide us with some relevant evidence. We can do this by trying to measure the difference in diameter by raping pieces of wire around each other like below.

The evidence it would give us is when we as an extra wire it so go up twice the time as the first go and when you put another piece of wire on it would be three times the first go.  

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