Electrical conductor Essay Example for Free

Electrical conductor Essay This would increase the resistance of the wire. Another reason why the 60cm wire the highest resistance is that the ammeter and the voltmeter could have been read incorrectly. One reason why the 100cm wire and the 80cm wire had a smaller resistance than the 60cm wire is that the coils of wire could have touched. If this did happen the length of the wire would be shortened. The current would take the easiest route, this being the shorter one meaning the current wont have taken long to travel along the wire. The more coils that touched the more the length of wire would have been shortened. There would have been less collision between the atoms of the wire and the electrons of the current. Also as the current wont have had as far to travel the electrons wont have had to squeeze together for as long as predicted. If this did happen I predict using the graph that the 100cm wire was decreased to an estimated 58cm, and that the 80cm wire was reduced to an estimated 55cm. I cannot prove that this is true, it is just a prediction. The sketch below shows what the graph looked like: The sketch below shows how I expected the graph to look: Evaluation I think that the 60cm, 80cm and the 100cm wires were all anomalous results. I think that all of these results are anomalous because the 60cm wire had a higher resistance than the 80cm and the 100cm wires , however the 80cm and 100cm wires had a lower resistance than the 60cm wire. I cannot tell which of the above statement is correct. The results could be anomalous because the ammeter and voltmeters were read incorrectly. Making the 60cm wire have a higher resistance than it should have had, or resulting in the 80cm and 100cm wires have a lower resistance than it should have had. The coils of wire on the 80cm and the 100cm wire could have touched, resulting in the length of the wire being shortened. This therefore would reduce the resistance of the wire because the current would take the easies route, which is the shortest instead of taking the longest route around the coil. This means that there would have been less collisions between the atoms of the wire and the electrons of the current. Therefore the current would have flowed faster than expected. Also as the electrons wouldnt have had as far to travel as predicted they wouldnt have had to squeeze together for as long, meaning there would have been less collisions between electrons and other electrons. The 60cm wire could have already been used. This means that it could have still held an electrical charge which would increase the resistance of the wire. Also all of the ice in the boiling tube could have melted meaning that the temperature would have increased, resulting in the resistance being increased. If I could repeat the investigation again there would be a number of changes that I would make. One of these changes would to decrease the lengths of the wire. The 100cm wire was too long and it was difficult to wrap the wire around the boiling tube without any of the coils touching. Also I could have used a bigger boiling tube that had a wider diameter. It would be easier to wrap the wire around the boiling tube without any of the coils touching. Also if more repetitions were done there would be less chance of anomalous results appearing. If I did the experiment again I would change the ice after each experiment. Therefore none of the ice would melt completely and the temperature wouldnt rise I dont think that the voltmeter and ammeter were read incorrectly because there are no massive changes in the two reading on the table. If I was to repeat the investigation I would make sure that the wire was new wire that hadnt been previously used and that the wire came from the same strip. I wouldnt change my graph because I fell that it is clear and easy to see where each length of wire is. Bibliography Below is a list of web sites that I used to fin out background knowledge for the investigation: www. essaybank. co. uk www. goggle. com www. sciencefinder. org www. sciencenet. org Here is a list of books that I used in my investigation:Â   Coordinated Science Physics Also I use Encarta 99 to find out information for the investigation.