I will also ensure that there is a clear indication that the power is isolated by means of a switch and an L. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot.
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.
This would have prevented the area of the wire from remaining constant and would have affected my results. I will then turn the power pack on and record what voltmeter and ammeter readings.
Discussion Overall, my results are very consistent with my predictions. I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack.
This confirms the first part of my prediction: However, I made sure that the wire remained straight throughout the experiment. 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.
I could have considered using a new piece of wire each time in order to regulate the temperature more stringently. In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4.
I have taken three reading and have worked out the average, shown in red. Variables There are different variables that can be changed in this experiment; these are the independent variable.
In addition, I will make sure I turn the power pack off after each reading. There are no anomalous results that I would consider to be far away from the line of best fit.
To support my prediction and conclusion, I could do further experiments. However, due to my line of enquiry, I will only change the length of the wire. Again, I will record the voltmeter and ammeter readings and turn off the power pack. For example, I could use different types of wire instead of using only nichrome.
I think my method could have been improved to produce results that were even more consistent. Most of the data points were on, or very close to, 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. 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 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. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire.
Overall, I think my method was sufficient to obtain reliable results. Using the same piece of wire throughout the experiment meant its temperature rose slightly over time, which may have affected my results.
Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction. 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.
Below is a table illustrating the effect of changing the variables see Table 2: I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit.
Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading. 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 control, using the power pack, how many volts pass through the wire. This was because I could plot a graph and show the general trend.
Results Below is a table of my results Table 3.The resistance of a wire is given by the equation: R = ρ x l/A Where R is resistance, ρ (pronounced 'rho') is the resistivity of the wire, l is length and A is its cross-sectional area. The gradient of each graph will give you the quantity ρ /A. Apr 19, · An investigation into the resistance of a wire.
Free GCSE physics coursework ultimedescente.coms: gcse physics science coursework: resistance of wire experiment Words: Views: Comments: 0 Risk Assessment To keep the experiment safe I shall keep electrical conductors away from the plug sockets.
Physics Coursework Investigating Resistance of wires. For my physics coursework I am investigating the resistance of wires.
When a metal wire is placed on an electric circuit the voltage from the battery makes the electrons flow through the wire. Dec 30, · Scholarships expiring soon › Forums › General Scholarship discussion › Gcse Physics Coursework Resistance Of A Wire Diagram – This topic contains 0 replies, has 1 voice, and was last updated by bharaninwinturk 4 months, 1 week ago.
Physics GCSE coursework: Resistance of wire Aim: To investigate if the length of wire affects its resistance. Prediction (Hypothesis): I predict that the longer the wire the higher the resistance, and the shorter the wire the lower the resistance.Download