HYPOTHESIS: My hypothesis is that the resistance will obey ohms law and I believe the graph and the results will show that the resistance paper obeys ohms law the graphs will tend to suggest that the paper does obey ohms law.
The width of the resistance paper I believe will affect the resistance paper in a very different way from the ohms law experiment I feel that the width when being reduced the resistance will rapidly fall.
The length is my other experiment I believe that it stands to reason that as you reduce the length of the paper the resistance will fall.
METHOD: There should be no safety problems because I am not using a large voltage for they’re to be any danger to my self or my peers.
When doing the experiment the room temperature should be kept constant to keep the heat from affecting the performance of the resistance paper.
When I have connected the circuit I will take measurements every 10mm or so. I will the record the results on tables and the analyse them to see if there was any strange results. I will however compare my results with my peers to see if I am on the right track so to spec. I will repeat the experiment twice to rule out the possibility of there being any human errors made by my self.
SAFTEY PRECAUTIONS: There are no real safety precautions for this experiment apart from watch in case of the battery over heats in any way because the room temperature has to be kept at a certain temperature in case of interfering with the experiment.
LIST OF APARATUS:
My apparatus will consist of:
- A battery
- Bull dog clips
- Crocodile clips
- Resistance paper
- Two multi meters
- 5-6 wires
RESULTS OF EXPERIMENT:
CIRCUIT DIAGRAM:
ANALISIS OF THE RESULTS: These results confirm that my hypothesis was correct. My hypothesis says that the longer the wire so to speak or the resistance paper, the resistance paper when it is at its longest is when the most resistance is at its most and more resistance can be past through.
ANALSIS OF GRAPHS:
GRAPH 1(A graph to show current/potential difference when testing to se if carbon paper obeys ohms law)
On this graph, we can see a straight line that suggests that resistance paper obeys ohms law. We have one anomalous result that is far away from the rest of the straight line it is of the scale the only reason for this is that I have drawn the graph to the best-fit line, which accounts for the anomalous result.
GRAPH 2(A graph to show length against resistance)
On this graph, we have a straight line which tells us that as we reduce the length the resistance falls. We have one anomalous result which is situated well below all the other results I can explain this result by saying it could only have been done by human error when drawing the final graph.
GRAPH 3(A graph to show if width affects resistance) On this we can see a curve the curve is making a gradual desent with no anomalous results this effects the resistance paper we can see that the shorter it gets the more resistance passes through because it has less space to travel so therefore can travel a lot quicker.
GRAPH 4 (A graph to show the formula this will show the inversely potential difference)
Here on this graph we can see the graph is moving up and down but then gradually goes down there are no anomolus results.
EVALUATION: My experiment went as god as it could have done, and I think I added enough data to rule out human error. I found in my experiment I had some anomalous results which was handy because I knew I had done my experiment correct I have also asked around my peers to see if they had anomalous results as well. I could do more calculations but I feel I have covered the topic enough to fulfil the needs of the project.
PRELIMINARY EXPERIMENT: Are preliminary experiment consisted of testing for ohms law in a resistor ii will include this graph and table in my project.
IMPROVEMENTS ON EXPERIMENT: To improve my experiment with what I had to use would be very difficult, because I would need more precise equipment and more time to do the experiment I would also have liked if I could test for other things that might have effected the resistance paper in any way. If I were able, I would alter the temperature and alter the properties and the thickness of the resistance paper. However, I believe my experiment went very well.
CONCLUSION: In this experiment I have found that resistance paper does obey ohms law and that when you decrease the width the resistance goes down. I also have found that when you decrease the length the resistance goes down. On my graphs, I had some anomalous results, which I knew were correct because the multi meter was very unstable and by the slightest knock, the resistance would change. However, I enjoyed my experiment and enjoyed finding out about new things in the physics and I thoroughly enjoyed the work and enjoyed performing the experiment.
