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 bump around with the vibrating atoms, so losing energy. When the electrons collide with the atoms the atoms vibrate to a great extent vigorously and the metal work overs hot. The Vari suitables: The thickness of the outfit:- If the electrify is thin there depart be more underground than if it was wider because there provide be fewer free electrons in the fit to carry the dash so less charge testament be able to flow. The space of the telegram:- If the wire is capaciouser, there testament be more impedance than if it was shorter because there ordain be more atoms in the wire for the free electrons to bump into. The temperature of the wire:- If the wire is hot the shield lead be greater because the atoms leave behind vibrate more vigorously and so the electrons leave alone collide with them more often. The worldly used:- Some materials bequeath aim more free electrons than others and so will be able to carry more charge reservation the unsusceptibility less. also some will have more atoms than others and so the electrons will collide with them more often, making the safeguard greater. My Chosen uncertain: I am spillage to investigate the duration of the wire. divination: I predict that if I increase the length of the wire, the resistance will also increase. I bring forward this because if the wire is interminable 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 reasonin g for this is that the observe for impedan! ces in series is that you add the resistance of separately resistor to observe the final resistance. Each 10 cm break up of wire will have the selfsame(prenominal) resistance so the resistance will go up in equal blocks. front Method: Apparatus: outfit, 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 hang on of wire and place it between the both terminals. 4: at one time 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: assume step 5 with the rest of the lengths of wire. 7: Repeat steps 3-6 two more mea authentic. 8: repulse an come of your results. 9: Put your results into a graph. Fair runnel Points: To make s ure my experiment remains a becoming test I will only variegate 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 all 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 leave alone tolerable change in resistance. I have prime that I do not need to use a battery run in my band. I have also found that throttle 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 humanity of wire and slide the crocodile clips up and down it. The next is my updated circuit: Also I will find the resistance o f 0 cm of wire and take this value past from my resu! lts 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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