But if the wire isshort, then you will see that the bulb lights up brightly. To help me plan my investigation I have completed a preliminary experiment in which I investigated the effect of the thickness of a wire on its resistance, using three constantan wires and one copper wire. 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 following is a list of variables that can be changed in the experiment that I will be doing: ÃÂ·Changing the length of the wire ÃÂ·Increasing the cross-section of the wire ÃÂ·Changing the material used ÃÂ·Changing the temperature ÃÂ·Changing the resistance of the wire ÃÂ·Changing the voltage going across the wire ÃÂ·Changing the current going across the wire For my experiment I will proceed to test out whether the length of the wire will affect the average resistance. I will also control, using the power pack, how many volts pass through the wire. You could also say that the shorter the wire the lesser the resistance, and the longer the wire the greater the resistance.
The independent variable will be the length of the wire because that is what I will be changing. Due to general scientific knowledge I know that metals have a low resistance and. They showed me how the relationship between the length of a wire and its resistance is directly proportional. To cipher the opposition of the wire I will split the electromotive force V by the current I. It is the energy that is needed to move a certain amount of charge electrons between to places.
Model Of Resistance: Resistance measures a materials opposition to the flow of electric current. The charge flowing in a wire is carried by the electrons that orbit the atoms that make up the wire. This is essential because a longer wire as hypothesised and theoretically proven before should have a bigger resistance. Which reduces its speed so to this the resistance increases also predict that the length of wire would be directly proportional to the resistance. Voltage is the push given to the current. I intend to work according to plan when the main investigation has started. Electricity is conducted through a conductor, in this case wire, by means of free electrons.
The relationship between resistance and temperature is not a simple one. This does not give rise to a straight line graph as cross sectional area is inversely proportional to resistance not directly proportional to it. To do certain that my measurings and observations were accurate I recorded them to two denary topographic points and used tested and checked voltmeters. Before repeating the process again, twice for all 10 measurements. § I should be careful when cutting the wire. I also think that the length of the wire and the resistance may be proportional and that if the length of the wire doubles, the resistance will also double.
This experiment has two sections which have to be carried out in order to get the correct results: Preliminary work: Find out which wire is the best insulator? You could besides state that the shorter the wire the lesser the opposition. To expand on my investigation I could also investigate the affects of different widths of the same wire to see what it would do to the resistance. The thing that I will change is the length of the section of wire to be tested. When there is no voltage applied electrons move randomly throughout the material. Resistance is the force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. I have chosen this alloy since temperature does not affect its resistance in a great way. Prediction ----------- I predict that if I increase the wire length the resistance will be greater because the electrons have a greater distance and longer time to travel giving a greater probability of colliding with the wire atoms.
If I tested again, I would maybe do 25 tests instead of 3, giving me an accurate answer and hopefully a more exact straight line on my graph. We define electrical resistance as the ratio of voltage to current. Insulators: An insulator is a material that does not allow electric current to flow through it easily. Hypothesis: I think that the higher the cross sectional area, the lower the resistance in the conductor will be. This means I can find and record the resistance. I'm assuming the volume of the wire remains … constant and of course that the wire is a cylinder.
Electric current is a flow of electrons, and it is these electrons that collide with the nucleus of the atoms. Hypothesis : I predict that when the length of a wire is increased, its resistance will also increase. I think that if you double the length of a wire, then the resistance will double as well, because it is twice the length of wire, therefore it is also twice as hard for the electrons to travel through the wire, as there are more ions and electrons contained within it. L is the length of wire, a cross sectional area and r the'resistivity' material 24 mar 201729 apr 2015. If they can pass through easily then the wire has low resistance and if they cannot pass through easily then the wire will have high resistance.
I will also wear safety goggles incase of any sparks or anything else that could damage my eyes. This shows that as the length of wire increases, the resistance also increases. In the metal wire, there are a number of atoms and free moving electrons. This will give me the opposition of the wire in ohms. This shows that my all of my results and readings are accurate and that I had no problems with any of the equipment.
A graph for this would be a bar chart not a line graph. This research establishes a connection between incomplete β-oxidation of muscle fatty acids to development of insulin resistance and oxidative stress. This means that they need only a tiny amount of energy in order to allow the electron to move. The longer the r rho l a where is resistance area as length of wire increases, its in variables that affect are conducting material, there four factors does not change each cm still gets same number volts across it category papers; Title and effect on. My prediction is- The longer the wire, the higher the resistance I think my prediction will be correct because the longer the wire gets, the more atoms there are for the electrons to pass. Improvements The procedure used was simple and straightforward and no difficulties were encountered. The electronic configuration of an atom determines how willing the atom will be to allow an electron to leave and wander through the lattice.