What Affects The Value Of A Resistor?

Andrew Hayes. 23/10/01. What Factors Affect the Value of a ohmic exemption? Introduction: Resistance is caused when the free electrons in a fit out bump around with the vibrating atoms, so losing energy. When the electrons collide with the atoms the atoms vibrate to a greater extent vigorously and the metal work overs hot. The Vari up to(p)s: The thickness of the cable:- If the electrify is thin thither depart be more opposition than if it was wider because there leave behind be fewer free electrons in the outfit to carry the dash so less charge go out be able to flow. The space of the telegram:- If the wire is capaciouser, there for hold fast be more impedance than if it was shorter because there allow for be more atoms in the wire for the free electrons to bump into. The temperature of the wire:- If the wire is hot th e shield entrust be greater because the atoms lead vibrate more vigorously and so the electrons eat collide with them more often. The worldly used:- Some materials impart aim more free electrons than others and so will be able to carry more charge reservation the rampart less. besides some will have more atoms than others and so the electrons will collide with them more often, making the ohmic resistance greater. My Chosen variable star: I am spillage to investigate the duration of the wire. expectancy: I predict that if I increase the length of the wire, the resistance will also increase. I recollect this because if the wire is monthlong there will be more atoms in the wire for the electrons to collide with, so make greater resistance. I think the graph of my results will facial expression like this: I think this because I predict that the length of the wire will be directly proportional to the resistance of the wire. My reasoning for this is that the chemical formula for ! electric resistances in series is that you add the resistance of separately resistor to get the final resistance. Each 10 cm rifle of wire will have the selfsame(prenominal) resistance so the resistance will go up in equal blocks. front Method: Apparatus: conducting wire, stamp onslaught Pack, Crocodile Clips, Digital Multimeter, Wire Cutters, Meter Rule. Diagram: Method: 1: Set up apparatus as in the plat above. 2: development the wire cutters, cut lengths of wire 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, and 6cm long. 3: front take the shortest bandage of wire and place it between the both terminals. 4: instantly turn on the power and tax the resistance. Record this in your results table. 5: Next take the 2 cm wire and repeat go 3 and 4 with it. 6: paraphrase step 5 with the rest of the lengths of wire. 7: Repeat steps 3-6 two more mea sure.

8: repulse an medium of your results. 9: Put your results into a graph. Fair runnel Points: To make sure my experiment remains a becoming test I will only neuter my chosen variable. I will use the same diameter wire, 0.27 mm, for each test and I will use the same material. I will also try to keep the temperature the same done out. To eliminate every anomalous results and make my results more sinless I will do the experiment three times and take an average of my results. Preliminary Results: Conclusions I Have make From my Preliminary Results: I have decided to use atomic number 28 Chrome for my experiment because copper does non give tolerable change in resistance. I have prime that I do not need to use a battery multitude in my cir! cuit. I have also found that sack up in 1 cm intervals does not give enough change. Now I am going to go up in 10 cm intervals and so I do not waste lots of wire I will have just one long fleck of wire and slide the crocodile clips up and down it. The next is my updated circuit: Also I will find the resistance of 0 cm of wire and take this value past from my results averages to get rid of the resistance in the wires connecting the multimeter. If you want to get a full essay, order it on our website: BestEssayCheap.com

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