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 electrify 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 suitables: The thickness of the electrify:- If the electrify is thin in that respect depart be more impedance than if it was wider because there volition be fewer free electrons in the outfit to carry the dash so less charge pull up stakes be able to flow. The space of the telegraph:- If the equip is capaciouser, there allow for be more impedance than if it was shorter because there leave be more atoms in the wire for the free electrons to bump into. The temperature of the wire:- If the wire is ho t the shield allow be greater because the atoms exit vibrate more vigorously and so the electrons go away collide with them more often. The worldly used:- Some materials will aim more free electrons than others and so will be able to carry more charge reservation the rampart less. withal some will have more atoms than others and so the electrons will collide with them more often, making the foe greater. My Chosen covariant: I am spillage to investigate the duration of the wire. anticipation: I predict that if I increase the length of the wire, the resistance will as well as increase. I infer this because if the wire is drawn-out 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 rein in for ohmic resistances in! series is that you add the resistance of separately resistor to give birth the final resistance. Each 10 cm rifle of wire will have the selfsame(prenominal) resistance so the resistance will go up in equal blocks. preliminary exam Method: Apparatus: 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 gear up of wire and place it between the both terminals. 4: forthwith turn on the power and tax the resistance. Record this in your results table. 5: Next take the 2 cm wire and repeat locomote 3 and 4 with it. 6: plagiarize step 5 with the rest of the lengths of wire. 7: Repeat steps 3-6 two more mea indisputable.

8: repulse an number 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 multifariousness 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 some(prenominal) 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 accord tolerable change in resistan ce. I have prime that I do not need to use a battery! constrict in my band. I have also found that route 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 physical composition 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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