From beautiful Pine Beach New Jersey: Solder constantan to constantan with minimal molecular contamination to the base metal from flux, cleaner or solder elements. It is incomprehensible to me why this topic isn't adequately covered in the instrumentation or nuclear fields.
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. 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.
Apparatus Ensuring 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 Constantan wire coursework the voltage for every reading.
In addition, I will make sure I turn the power pack off after each reading. I will try to make this investigation as accurate as possible. Variables 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 of 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: Variables Safety 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.
Results Below is a table of my results Table 3. I have taken three reading and have worked out the average, shown in red. This confirms the first part of my prediction: In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4.
Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction. Discussion Overall, my results are very consistent with my predictions.
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. There are possible 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 the 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, 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 to produce results that were even more consistent.
I could have considered using a new piece of wire each time in order to regulate the temperature more stringently.wire is longer, this means electricity has further to travel, but because it is in a longer wire, collisions will be less frequent. - The Constantan wire is very thin: therefore there is a smaller area for electrons to travel through.
On their journey from negative to positive, there . Dec 14, · what should be the resistance of constantan wire over a meter at room temperature if the thickness is 26? I've just done my physics coursework and my reading was ohms, but my teacher's told me to find out what it should monstermanfilm.com: Resolved.
Damn coursework. Am i meant to write a prediction? What am i meant to put in it?! Resistivity of constantan wire watch. Best is to measure the resistance of different lengths of wire.
Plot a graph to get an average value for R/L.
Multiply this by an average cross-section to get resistivity. 0. Constantan was chosen as unlike most metals, its resistivity does not change when the temperature is raised so the results will not be affected by the wire heating up.
Method and apparatus Take two lengths of constantan wire, one 34 SWG (standard wire gage) and the second 30 SWG. Soldering Constantan Wire (Nickel/Copper Alloy) for Thermocouples Q. Subject: Solder Type "T" thermocouple extension wire (copper/constantan). Solder constantan to constantan with minimal molecular contamination to the base metal from flux, cleaner or solder elements.
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