When the electrons pass through the wire they hit the protons and rebound and hit more protons and so this will happen till it gets back to the energy source.
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.
However, I made sure that the wire remained straight throughout the experiment. I will stand up during the investigation to ensure that I do not injure myself if something breaks. Discussion Overall, my results are very consistent with my predictions.
Then, I recorded the readings on the voltmeter and ammeter. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons. I will then turn the power pack on and record what voltmeter and ammeter readings.
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. These collisions convert some of the energy that the free electrons are carrying into heat.
In addition, I will make sure I turn the power pack off after each reading. How is it measured? These measurements are then applied to this formula: Since the voltmeter was set to 3 volts, those recordings were all the same. My Prediction My prediction is that when the length of the wire is increased so does the resistance of the wire and so the current decreases.
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.
Again, I will record the voltmeter and ammeter readings and turn off the power pack. Online Plagiarism Checker The resistance of a wire - Sample Essay My prediction is that when the length of the wire in a circuit is increased, the resistance also increases.
Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction. Apparatus The Apparatus I will be using is as follows: I have used the nichrome wire because it has a higher resistance then the copper wire, has an almost Zero resistance, so nichrome wire was used to give a more positive resistance.
Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading. Also if the temperature of the room is increased then the resistance will to, because the nuclei start to vibrate more.
However, due to my line of enquiry, I will only change the length of the wire. The light bulb was used so we could tell that the connection was correct it would light if the circuit was connected properly.
Furthermore, the resistance of a metal increases as its temperature increases. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot.
This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire.
The resistance of a length of wire is calculated by measuring the current present in the circuit in series and the voltage across the wire in parallel. It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities.
I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack. Electricity is conducted through a conductor, in this case wire, by means of free electrons. I could have considered using a new piece of wire each time in order to regulate the temperature more stringently.
For example, gold has more free electrons than iron and, as a result, it is a better conductor. Variable Resistor Special wire in different lengths First I started with the longest measurement, cm.
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.Physics GCSE Coursework:Factors affecting the resistance of a wire test for the lengths, and I will then do the following points; 1.
Take the wire securely to the meter Ruler tightly on both ends, do this so that the reading for the length will be more accurate, and also so there will be no bends in the wire to. This is shown because when the length of wire was 40cm long (28 gauge) the resistance average was 2.
9 ohms, at cm the resistance average was 5. 4 ohms and finally at cm the resistance average was 7. 9 ohms. Apr 19, · 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 ohms; when the length of the wire is 40cm the resistance is ohms, which is Reviews: Join now to read essay Physics Coursework Theory - Resistance of a Wire Theory behind my experiment Thickness (cross sectional area of the wire), length, and temperature all have some effect on the amount of resistance created in a wire/5(1).
Gcse Physics Coursework - Resistance of a Wire Coursework This Coursework Gcse Physics Coursework - Resistance of a Wire Coursework and other 64,+ term papers, college essay examples and free essays are available now on ultimedescente.com Autor: review • November 2, • Coursework • 2, Words (9 Pages) • 2, Views4/4(1).
Mar 15, · Im doing my resistance of a wire coursework and ive done all of it apart from the last bit where i have to describe how the experiment testing the resistance of a wire could be used in a workplace.Download