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GCSE Science (Collins Study & Revision Guides)|Mike Smith.
Electricity flows in metals. The metal is full of "free" science coursework help gcse that do not stick to any particular atom; rather, they fill the space between the atoms. When science coursework help gcse electrons move, they create an electric current. Conductors have resistance, but some are worse than others. The free electrons keep bumping into atoms. A wire's resistance depends on four main factors:.
I will investigate how the length of the wire affects the resistance. I have done a preliminary experiment to help me decide the best way to do my investigation. The results will help me make predictions, as well, science coursework help gcse. Below are my results from the preliminary experiment see Table 1. To ensure accuracy, I have taken three readings each of volts and current. These results show that as the length of the wire increases, the resistance increases, as well.
Furthermore, if you double the length of the wire, the resistance is roughly doubled. For example, when the length of the wire is 20cm the resistance is 3. In my main investigation I will see if this observation applies to my results. I found that the apparatus I used was suitable, but I think that I could possibly increase the number of data points to generate more reliable results, perhaps by increasing the length of the wire by 5cm each time, instead of by 10cm.
I predict that the longer the wire, the larger the resistance. This is because the free electrons in the wire bump into more atoms, thereby making it harder for electricity to flow. Similarly, the shorter the wire, science coursework help gcse, the smaller the resistance because there will be fewer atoms for the electrons to bump into, thereby easing the flow of electricity.
Furthermore, the resistance of a wire is directly proportional to the length science coursework help gcse inversely proportional to the area, so doubling the length of a wire should increase the resistance by a factor of two. This is because if the length of the wire is doubled, the electrons bump into twice as many atoms, so there will be twice as much resistance.
If this is correct, the graph should show a positive correlation. First, I will collect the apparatus I need and set it up as shown in Diagram 1, below. Next, I will set the power pack on the lowest voltage possible to ensure that the current passing through the circuit isn't too high which could potentially affect the results because the wire would get too hot.
I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. I will then turn the power pack on and record what voltmeter and ammeter readings. I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack, science coursework help gcse.
Again, I will record the voltmeter and ammeter readings and turn off the power pack. I will repeat this method every 5cm until I get up to cm, taking three readings from both the voltmeter and ammeter each time to ensure accuracy. To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading. This will reduce the chance of false readings and will cancel out any anomalous results.
I will also ensure that the wire does not heat up too much by confirming that I do not set the voltage too high on the power pack and by maintaining the same the voltage for every reading. In addition, I will make sure I turn the power pack off after each science coursework help gcse. I will try to make this investigation as accurate as possible. There are different variables that can be changed in this experiment; these are the independent variable.
However, due to my line of enquiry, I will only change the length science coursework help gcse the wire. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire.
I will also control, using the power pack, how many volts pass through the wire. Below is a table illustrating the effect of changing the variables see Table 2 :. I will ensure experimental safety by confirming that all the wires are connected properly and that none of the insulation on the wires is worn. I will also ensure that there is a clear indication that the power is isolated by means of a switch and an L. I will stand up during the investigation to ensure that I do not injure myself if something breaks.
Below science coursework help gcse a table of my results Table 3. I have taken three reading and have worked out the average, shown in red. Table 3 shows that as the length of the wire increases, the resistance increases, as well.
This confirms the first part of my prediction: that the longer the wire the larger the resistance. In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4.
Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction. Overall, science coursework help gcse, my results are very consistent with my predictions, science coursework help gcse.
Most of the data points were on, or very close to, the line of best fit. There are a few data points that are farther away from the line of best fit than the others, but they are still consistent with the general trend. There are no anomalous results that I would consider to be far away from the line of best fit, science coursework help gcse. There are science coursework help gcse sources of error that might have led to inconsistent results, such as a kink in the wire.
This would have prevented the area of the wire from remaining constant and would have affected my results. However, I made sure that the wire remained straight throughout the experiment. I think that the range of my results was sufficient enough for me to draw a valid conclusion about how the length of the wire affected science coursework help gcse resistance.
This was because I could plot a graph and show the general trend. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot.
Also, science coursework help gcse, the apparatus I had use of at school would not be suitable if I were to keep increasing the length of the wire; e. I think my method could have been improved science coursework help gcse produce results that were even more consistent. I could have considered using a new piece of wire each time in order to regulate the science coursework help gcse more stringently, science coursework help gcse.
Using the same piece of wire throughout the experiment meant its temperature rose slightly over time, which may have affected my results. However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson. Overall, I think my method was sufficient to obtain reliable results.
To support my prediction and conclusion, I could do further experiments. For example, science coursework help gcse, I could use different types of wire instead of using only nichrome. I could also consider using different cross-sectional areas of wires or even change the temperature of the wires deliberately and see how manipulating these variables affect the resistance of the wire.
very good, but where are the dependent and the control variables? also include some exam questions and how to achieve marks as people who are reading this are most likely to be science coursework help gcse exams! nevertheless this is a very good experiment report. Thanks a lot, this really helped me with my physics lab report. I will make sure to site it and give you full credit! needs conclusion but this is very well done.
thanks so much. but also keep in mind that it does not double, but only increases in small episodes xx. had the perfect answers but for the conclusion you needed to add an example of your results, that's what my science teacher says, besides thatthis is a great source of information really helped me with my homework.
What was the SWG Standard Wire Gauge or diameter of your wire? I know you stated it was Nichrome, and cm long, but the SWG is not stated - Am using your data as secondary data and need to compare my investigation and yours. do you know what the thickness of the wire is? it doesnt say on here and it would be really good information for those like me who need to use it as a secondary source in their controlled assessments.
This had really helped me with my Year 9 work. I really appreciate the info you have logged into this. Once again, thank you! hi this was really helpful im currently doing my CAU for year 11 and this was a great help thanks. Marine Biology. Electrical Engineering. Computer Science. Medical Science. Writing Tutorials. Science coursework help gcse Arts.
Visual Arts. Student Life. Vocational Training. Standardized Tests, science coursework help gcse. Online Learning. Social Sciences. Legal Studies, science coursework help gcse. Political Science. Introduction In this article I will investigate what affects the resistance of a wire.
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, time: 5:26An Investigation Into the Resistance of a Wire - GCSE Physics Coursework - Owlcation
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