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What effects the flow of current in the wire?

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What effects the flow of current in the wire? AIM In my investigation is aim to see how the length of a wire will affect the flow of current through the wire. PREDICTION I predict that if the length increases then the resistance will also increase in proportion to the length. I think this because the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the length is doubled the resistance should also double. This is because if the length is doubled the number of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance. If the length of the wire is only half the length of the wire there should be half the number of collisions between the electrons and the atoms. If the wire is twice the length there should be twice the number of atoms resulting in twice as many collisions and I also predict the doubling of resistance. Scientific Knowledge Current An electric current is a flow of charged particles. In a metal conductor these charges are electrons, which are part of the metal atoms and are able to move if they are given energy from a power supply. An ammeter is used to measure current; the unit of current is called an ampere or amp (A). The current readings on all the ammeters will be the same, so no current is used up in the flowing round the circuit. ...read more.


Then returns back to the positive terminal once been through the circuit. This occurs until the battery finally runs out. *Battery power is direct *Mains power is alternative SAFTEY KNOWLEGDE In the past I have studied about the power supply, the knowledge that I have gained is about a variable resistor, safety using plugs and power supply. What is a variable resistor? A variable resistor is sometimes necessary to vary the resistance in a circuit or in an electrical appliance. They can be used to vary the brightness of bulbs etc. If u turn the resistance up the current drops. Turn the resistance down the current goes up. Why we use a plastic plug? The reason we use a plastic plug is simply to prevent humans from being electrocuted because plastic is a non- conductible product. Why do we use a fuse in a plug? Reasons: *To prevent fires which might occur if large currents cause parts of the wire to become hot. *To prevent an electrical shock to humans. A fuse I simply a thin wire which melts if the current passing through is too large. When a fault occurs, the fuse melts, this then breaks the current in the circuit. APPARATUS I will need the following equipment in my experiment: *Battery *Ammeter *Volt meter *Mounted wire attached to a meter ruler *Crocodile clip *Some wires FAIR TEST After looking back at my results I think that I can improve my results by doing the following: Change the battery after each result due to the lose of energy in battery, since ...read more.


CONCLUSION In my prediction I said that if the length increases than the resistance will also increase in proportion to the length. From my results table I have shown that my prediction was correct. The length of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion. The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material, so if there is a larger number of atoms there will be a larger number of collisions, which will increase the resistance of the wire. If a length of a wire contains a certain number of atoms when that length is increased the number of atoms will also increase. EVALUATION After looking back at my results, I thought the method I choose was the best way to investigate the experiment. Although this was done using available equipment provided by the school. My results were good enough for my investigation however I could have improved it to get accurate results. To obtain this improvement I could have controlled the temperature, by doing experiment on a hot day and the other on a cool day. I could have also tried using 240v instead of a battery supply, because of the lose of energy in the battery. If I were to do this investigation again I would take these precautions before I started investigating. Science Investigation What effects the flow of current in the wire? _____________________________________________________________________ 1 Satish Karsan 11K5 ...read more.

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