There was a little hole where the thermometer would sit to measure its temperature. It did not measure the average temperature of the block itself. This was the way the teacher told us to do.
The block has a layer of thick cardboard wrapped round the outside, not sure what was on the bottom but there wasnt much we could do with the top as the immersion heater and the thermometer stuck out. This method was the heater circuit you mentioned. Though i would research about the calorimetry method you suggested. Are these used in chemistry?? I remember from AS chemistry about calorimeters and a great long accurate thermemoter like device capable of measuring the temperature in a great amount of accuracy. Its a bit of a bad time now to find out what my school has as its our one week holiday.
It was set yesterday and the planning stage must be finished in a week and its one month for the practical, analysis and evaluation. If i am able to plan the experiments for both metals and non-metals especially the resistivity part then i will include it in and see what the teacher thinks about this. Your concern that a non-metal will have an impossibly high resistance is understandable, but This is not hard to do : you just have to use a shape that is a thin sheet and pass the current through its thickness. However, this will involve one little difficulty - you can't just connect wires to the sides of the sheet.
of a wire. Free GCSE physics coursework essay. In this article I will investigate what affects the resistance of a wire. . However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson. . I really appreciate the info you have logged into this. Physics Coursework: Factors affecting resistance of a wire. Hypothesis I think that as you increase the length of the wire, you also increase the amount of.
This way, the cirrent will not make use of the full area. What you'll have to do is use copper plates on either side of the sheet and attach the wires to the plates.
For another suggestion on a metal to use : I recommend stainless steel. It has a considerably poor thermal conductivity and will make for an interesting data point. My suggestions for materials will update as I get better ideas : Elemental metals : 1. I understand what you are saying Gokul The length and thickness of the non-metal should be small in order for its resistivity to be measured.
I know that by using leads as connectors to conencted the various devices together to form a circuit, the actual physical conenctions made do have little resistance and i think i will include that in the coursework and there isnt much i could do. And there is one part about fair testing. If i make the non-metals significantly small, do i have to make the other materials the same length and thickness.
Last edited: Feb 16, From looking at the equipment my school can provide, it seems i would have to measure the specific heat capacity of the blocks using the heater circuit method. At the moment i would have to use the same block to measure the resistivity as well.
I am thinking of a solder method for this and whether it is appropriate? I will use a thin metal sheet of copper or another metal and solder it to the bottom of the block.
I will have to measure its resisticity in some way by passing a current though it which at the moment i have no idea on how to do. I will have to obtain a lot of results and hopefully plot a scatter graph with specific heat capacity and resisivity as the axis.
Is this a valid method? Last edited: Feb 23, After having a discussion about how i was going to do things, it ended up with me measuring the specific heat capacity of the blocks using the heater circuit method.
The resistivity will not be done using the solder method as there will be lots of errors and i will do this using wires made of the same material as the block. But i mentioned the resistivity formula where i measure the resistance of the wire of length say cm and measuring the average voltage and average current readings and using the calculated value to get the resisitance of the wire. So far i will measure the specific heat capacity of an aluminium block and an iron block, resistivity of the aluminium and iron wires, repeat at least 3 times.
My school were unable to find any different blocks And i am allowed to look in the data book for other metals and their resistivities and hopefully see if there is any correlation between the specific heat capacity y axis and the resistivity x-axis. The school has gave me a roll of iron wire but its a littl bit rusty, will this have a major effect on the resistance of the wire? ANd also i have a question.
Can the cooling correction be applied to an aluminium block as well as liquids? This is where you leave the block to get to its max temperature without passing current through it and record the time it takes for the temperature to be 10 degrees below its maximum. With the time measured, i think i would have to draw a graph with temperature against time and find the area underneath the part with a negative gradient cooling stage. And one thing, the cooling correction on the aluminium took very long to cool down by 10 degrees average about an hour whilst the iron took about 35 mins.
I pass current through the block for 20mins. Will there be much error if i decided to measure the time taken for the metal block to cool by 5 degrees? I can't say anything about this, because I don't know what you do with the area under the graph. How does this area serve as a correction, and what does it correct? I have to find the constant of proportianality k?
Q The constant k multiplied by the integral between T1 and T2 is heat lost during cooling? Q' The change in temperature is what im trying to find here. And also i tried to measure the resistance of the aluminium wire using a circuit and was no good. I used the meter bridge which consisted of a wire of uniform resistance, galconometer, a known resistance soldered three resistors , unknown resistance.
There were like to gaps in the whole circuit, one was for the resistor and one was for the unknown resistance.
When putting the unknown resistance aluminium on the left gap and the knwon resistance on the right gap, i moved the jockey which was like a pen along the wire of uniform resistance. Plan an investigation into the hypothesis that length of wire effects resistance. Key words and looking at the precision and units of measurement of different instruments. Analysing, concluding and evaluating the experiment. Introductory A-level Physics Practical?
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