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Investigating The Factors Which Affect The Resistance In A Wire

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Investigating The Factors Which Affect The Resistance In A Wire Can Erdogan 11A Contents * Strategy: Page 1 * Collecting Data: Page 2-5 * Interpreting Data: Page 6-7 * Evaluation: Page 8 Strategy Introduction/Method: The aim of my investigation is to see how the length affects the resistance on wire. To do this we would be carrying out many experiments by using the right methods to help us to get the most accurate results we can. In our experiment we were investigating the effects on the resistance. In order to find out which metal is the best we had to change some of the factors. We changed the type of wire that we used (Nickel and Copper) and the length of the wire. The length of the wire will change as well so that we can get detailed results; it would be changed by placing 1meter of wire on a ruler measuring up to 1metre and placing the automotive clips on the part where the length sums to the right amount for each test. The temperature would affect the resistance because it would make the atoms vibrate more rapidly so what we would do to stop that from happening is that we would take a 20 second break from each test so that the wire has enough time to cool down. What I expect to happen is that if the wire is longer, then the resistance would increase because there would be more metal atoms for the electrons to go through meaning that there would be more collisions between the atoms and the electrons so it would be harder for the electrons to travel. ...read more.


We took averages from the tests so that the unreliable would be unnoticeable. Class Room Temperature If some parts of the room were too warm then the heat would affect the wire because it would cause more atoms to vibrate. We would have done our experiment by the window were it was cool so the heat would have little effect. Heat of the wire As the wire heats up from the friction of electricity it cause the atoms to vibrate more causing more electrons to be blocked by the atoms and that would give us odd results. We would leave the wire to cool down for 20 seconds and the wire would only have the current travelling through for 5 seconds max so that the resistance does not increase. We also did the whole experiment in one day so that the room temperature stays the same and has little impact on the resistance. Length not measured accurately If the length was not measured accurately then we would get inaccurate results which would lead to outliers. We used a metre stick so that we were able to see how long the wire was and it allowed us to get a better measurement. We would also stretch out the wire as much as we can so that the wire doesn't curl up and fold in the extra length. Range of Length If the range in length was not suitable then it would be hard to come up with an accurate conclusion. When taking length we went up in 10s so that range is big enough to make a comparison. ...read more.


What shows that my conclusion is reliable is that my graph proves that if I have more metal lattice then the resistance to increase because there would be more atoms stopping the electrons to pass through the wire which increases resistance. But the reason why my conclusion is not perfect is because of the limitations which is had more example; as the electrons were passing through the wire, it causes the wire to heat up due to friction from the electrons hitting the metal lattice which would cause an increase in resistance because the heat created by the friction causes the atoms in the wire to vibrate more thus blocking more elections and as the resistance increases it cause the metal lattice to heat up even more which adds more resistance to the wire. Other limitations were the length of the wire. Since the wire was not stretched out when we were measuring the length of the wire so there would have been hidden lengths while we were measuring the wire. Since the readings of the lengths were not accurate we were likely to have gotten results for a different length. Another limitation was the automotive clips, the thickness of them may have added more resistance to the wire and could have causes the readings to be inaccurate because the added length would have increases resistance therefore giving odd results which is why a very few error bars were slightly bigger than the rest. But since most of my error bars are very small it proves that my conclusion is reliable. ...read more.

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