10 Cm Of Wire example essay topic
588 words
Aim To investigate the resistance of a wire using the equation V = IRPredictionI predict that resistance will be directly proportional to the length of the wire. P. 6 a / P. 8 aApparatuso Voltmeter o Ammeter o Piece of woo do Copper wire (100 cm) o Crocodile clip so Connecting wire so 2 CellsDiagramMethodo I am going to have my experiment all set out with the apparatus as in the diagram above. The copper wire of 100 cm connected firmly to the piece of wood (wood is used as it will not interfere and not conduct. o I will then connect everything up except for the cells with the connection wires. o Then I will put the crocodile clips at 10 cm of the copper wire o Then the connection wires will be connected to the cells until a firm reading of Current and Voltage is read. o This will only be a short time as it may begin to heat up as the electrons will flow quickly between 10 cm of wire and will not take as long, which would cause my results to be inaccurate. o This will be repeated at 10-90 cm and then repeated a further 3 time so When I get to 90 cm and I connect the wire I will have to do it very quickly as the wire will be shortest and will heat up immediately. In other words Resistance is directly proportional to length. This is because the longer the copper wire the longer it takes for electrons to travel to the end, making the resistance of the wire longer. A. 8 aMy conclusion does support my prediction because it agrees that it is directly proportional as the straight line is formed like my graph in my prediction. Evaluation On my graph there is a very strong positive correlation as all the points plotted are on or very close to the line of best fit. It means that my measuring has been as accurate as possible.
It's reliable because the points are on the line. If it wasn't reliable they would be spread out and there would be no correlation. There were, however, five anomalies but they still lay close to the line. From my graph and table the anomalies are as follows: o result number 2 with a length of 20 cm and a resistance of 2.23 was just off the line, o result number 4 with a length of 40 cm and a resistance of 4.37 was just off the line, o result number 6 with a length of 60 cm and a resistance of 5.75 was just off the line, o result number 7 with a length of 70 cm and a resistance of 7.69 was just off the line, o Result number 8 with a length of 80 cm and a resistance of 9.45 was just off the line. The procedure was suitable but not entirely accurate.
This is because temperature can be a variable which can cause faults in my results. Temperature cannot be controlled. It causes the resistance to increase. I could increase the number of times I do the experiment which would provide a more accurate average. This would improve it because there would be less able to make a mistake.
My evidence, in my opinion, was very reliable as there were very few true anomalies that lay far from the line. E 6. b.
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