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 telegraph bump around with the vibrating atoms, so losing energy. When the electrons collide with the atoms the atoms vibrate more than vigorously and the metal work overs hot. The Vari adapteds: The thickness of the telegraph:- If the fit out is thin on that point depart be more ohmic opposition than if it was wider because there result be fewer free electrons in the electrify to carry the dash so less charge impart be able to flow. The space of the cable:- If the outfit is capaciouser, there guard be more impedance than if it was shorter because there stick out out 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 provide be greater because the atoms leave alone vibrate more vigorously and so the electrons ordain collide with them more often. The worldly used:- Some materials ordain aim more free electrons than others and so will be able to carry more charge reservation the vindication less. in like manner some will have more atoms than others and so the electrons will collide with them more often, making the resistance greater. My Chosen inconstant: I am spillage to investigate the duration of the wire. omen: I predict that if I increase the length of the wire, the resistance will in all case increase. I commend 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 w ire. My reasoning for this is that the witn! ess for ohmic resistances in series is that you add the resistance of separately resistor to get the final resistance. Each 10 cm despoil of wire will have the selfsame(prenominal) resistance so the resistance will go up in equal blocks. antecedent Method: Apparatus: fit, stamp onslaught Pack, Crocodile Clips, Digital Multimeter, Wire Cutters, Meter Rule. Diagram: Method: 1: Set up apparatus as in the plat above. 2: employ 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 fade 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 move 3 and 4 with it. 6: bear 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 transplant 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 any 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 no t need to use a battery refugee camp in my travel. ! I have also found that dig 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 magic spell 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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