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Resistance of a Wire Investigation

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PLANNING There are numerous factors that I could use to investigate, from these I have chosen four main factors. Again from these four I have chosen one factor that I will investigate and planned a suitable experiment around this choice. My work Is as follows: Which factor to test? * Temperature * Length * Type of wire * Thickness Chosen factor: From these factors I have chosen to use how the length of a wire affects the resistance of the wire. I feel this is the optimum factor to investigate, as it is easiest to control and measure. Predictions: I believe that the resistance of a wire is directly proportional to the length of the wire. I predict that as the length of the wire increases so will the resistance of the wire. The resistance is also dependent on the amount of volts pushing the electrons through the circuit (current). Fair Test: I will try to make the test as fair as possible, I will use the same wire each time and will adjust the position of the crocodile clips for each different measurement (using the same metre stick rulers). ...read more.


4. Take a reading at 200 cm (or 10cm) and record the voltage through the wire. 5. Move 1 crocodile clip along the ruler down (or up) by 10cm, to 190cm (or 20cm) and record the next observation. 6. Repeat for all lengths from 10cm to 200cm and record results in a table as shown. 7. Calculate the resistance for each length of wire (Resistance = Voltage divided by Current, R=V/I 8. Record results in table. Results: Length Amps PD Resistance ( cm ) ( I ) ( V ) ( ) 200 0.1 7.63 76.3 190 0.1 7.62 76.2 180 0.1 7.25 72.5 170 0.1 6.87 68.7 160 0.1 6.41 64.1 150 0.1 5.99 59.9 140 C 5.64 56.4 130 O 5.10 51.0 120 N 4.54 45.4 110 S 4.20 42.0 100 T 3.84 38.4 90 A 3.47 34.7 80 N 3.31 33.1 70 T 2.80 28.0 60 0.1 2.38 23.8 50 0.1 1.80 18.0 40 0.1 1.48 14.8 30 0.1 0.83 8.3 20 0.1 0.51 5.1 10 0.1 0.13 1.3 ...read more.


Conclusion I feel that the experiment was a success as there were only three measurements that needed to be repeated. The experiment proved to be very fair as all the results followed the same line of best fit with very little deviation. This may have been caused by changes in the temperature of the surroundings or the accuracy of the measuring of the length may have been slightly off. I have been drawn to the conclusion that the length and resistance of a wire are directly proportional to one another. ie. That as the length of the wire increases then so does the resistance of the wire. I think that this is due to the amount of electrons being pushed around the circuit. The same amounts of electrons are being pushed around the circuit each time but they have a different distance to travel. When there is a further distance to travel the electrons will need more force to make them travel that distance, and so the resistance slowing them down will increase. 1 ...read more.

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