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I believe that if we follow all these rules, then there will be no mistakes, and we will end up with good results. All talking will be done quietly and only amongst are group. Another safety measure that people forget is that if you break something in class, it should be immediately told to the teacher for safety. The apparatus that I am going to use in my main experiment are as follows Volt meter Ammeter Crocodile clips 2 Pliers Metre ruler Connecting wires Power supply Constantan wire.
These apparatus will be handled with care, as it is important that I set it all up correctly and safely. I want my results to be extremely good, and just the way I predicted them to be. The information and the results that I am using is first hand experience. I am going to do each experiment and then place my results into a table. The reason I put these results into a table is simply because it is clear to understand and is much neater.
I will use my results to make predictions and make graphs. This will help me compare results.
Comparison of results is vital because it is important to see which reaction was fastest, and again this is important because then I can make a conclusion, discussing why a certain experiment was faster than other experiments. When I do the experiment, I will be prepared with my results table, so all I have to do is to read the readings of the voltmeter and ammeter and then place the digits in to my organised table.
To make my experiment a fair test, I intend to do everything the same. I can’t use the same lengths as this is one of my variables, but I want to use the same setup every time I do a test.
What I mean is that the apparatus have to be the same for each test, because this would be unfair. Equipment has to be the same, you cant use one normal voltmeter which is brand knew, and then for the next experiment use a slower voltmeter, even though voltmeters should all be the same, there can be errors in the equipment it self. It should be very fair when I read the numbers off the screen. Though somewhere where I need to be more careful is when I cut the constantan wire to there measurements. It needs to be accurate so it is fair. Accuracy needs to be realised throughout the experiment.
For it to be a fair test, when I make comparisons, I do it correctly for the right experiments. I hope I don’t make any errors in my work because it is important that the tests are done fairly in order for conclusions to be correct. Accuracy was mentioned above, but I need to state the fact that without accuracy, conclusions can’t be correct. I need to be accurate when cutting the wire, making sure that it is the correct measurement and not a cm over either way. Accuracy is also needed when I set up the experiment; it needs to be correct and done efficiently so work can proceed quickly.
The last place where accuracy is fundamental is when reading the numbers. I need to take down the exact numbers, so the results are accurate enough so a conclusion can be drawn up. I have chosen to do two variables. My first variable is to change the length of the wire. This is again giving me a wider range of results and also I will have more tests to base a conclusion on. The way I am going to change the lengths is by, with the pliers cut a wire 1 meter long. Then do the test for 1meter. Then cut 10 cm and I will repeat it all the way to 10 cm. My second variable is by changing the widths of the wire.
This experiment is different from the other ones. The way I intend on doing this is by using different wires, with different widths. One may have 36 SWG and another only 28 SWG. I will then compare the widths with widths, and the lengths with lengths. Below is the blank table, this shows how I am going to set out my results. Length (cm) Volts (V) Amps (A) Resistance (Background knowledge For this part of my coursework I am going to discuss a few things that affect or play a role in the experiments that I am going to do.
There are many things that affect the growth of a plant, like sunlight and oxygen levels. In the same way my experiment has things involved in it which I would like to talk about. The first topic I am going to talk about is the things I am using. Ohms law is a big discovery made a long time ago. Firstly we need to know what ohms law is? Ohms law is a definition which helps us to discover the resistance of a circuit. Ohms law simply states – Resistance = voltage Current Ohms law consists of three things Voltage Current Resistance Now I will explain what each of these mean.
Voltage – Voltage is an electric potential difference between two points on a conducting wire. Voltage is measured in volts. Voltage comes from various sources. Two examples of these sources are batteries and electrical outlets. Current – Current is measured in amps. Current is charged particles which flow from the voltage source through conductive material to a ground. Resistance – Resistance is the opposition that a material body offers to the passage of an electric current. Resistance is measured in ohms. Examples of items with resistance are light bulbs, hair dryers, toasters.
The reason for resistance coming about is very simple. When there is a force on way, there is always a force working the opposite way. This is like are muscles, one is contracting and the other relaxing. Also when you drop out of the sky, gravity is pulling you down, and air resistance or up thrust id acting against you. In the circuit, current is flowing one way, and what makes it slower, resistance. Resistance is slowing something down, a force acting against you, and all ohms law does is justify and state this simple law of resistance.
Resistivity is simply the amount of resistance a circuit can handle, otherwise known as bulk resistivity. The range of my work is good, because I believe I have different sets of data. The good thing is that they are all varied from one another, they are all different. The thing with having different amount of data is that more comparisons can be made, and a greater expertise of conclusion can be made. It is important that when I am working, that my results are sufficient enough to base a conclusion on.
The conclusion has to be accurate, and having a greater range of results is good, as I can identify any anomalies and make an accurate conclusion with the data where there are no errors. I can only do this if I have more data to work on, so I believe that I have done enough work so if any errors appear I can work around it. I think my experiment will be good and exciting, as the results will provide good solid data, which I hope is error less. As a conclusion, I can say that my preliminary experiment went very well, and I am looking forward to my main experiment because I want to see if my results turn out the way I wanted it too.
Now I will tell you what I think will happen. I predict that for my second variable, using width, I think the resistance will be the highest for the thinnest wire, which in my case is SWG 16; it will be interesting to later on see if I am correct. For my other variable, consisting of length, I predict that the highest resistance will come at the longest wire. My predictions went just guesses; I am going to explain why I think what I think. I believe that the thinnest wire will have more resistance, because I think that there will be a smaller surface area on the wire, resulting into more resistance.
What I am saying, the bigger the area, the less resistance, as there is a larger surface area to cover. For length, I predicted this to happen because I think the longest wire, which is 100cm is spread out, resulting larger body area, so there would be more resistance as it is long and thin, whereas the shorter ones, would have less, also because there is not enough time for all the particle energy to be stopped, as the length is small, and it travels very fast, so the particles would be hard to stop, so the resistor wouldn’t be as effective.
In conclusion, I believe I have made suitable comments about my preliminary experiment, and believe my main experiment will go just as well, if I work hard and follow instructions. I also think that I have made and detailed my experiment very carefully, and not forgetting details which could lead to inaccurate results. It is important that I continue to follow the steps I have laid down. I have made a suitable prediction backed up with my background knowledge, and my plan is good, and with hard work, I should be able to achieve good and satisfactory results. Obtaining evidence.
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