For instance a 10cm wire has 5 atoms, a 20cm wire has 10 atoms. > @ B D J L ��������������ɻ�������������������������������� j: h�_� UjH= Complete all trials in the same area/room, in the same time of the day, using the same materials.
It is clear now that resistance is an important attribute that has been applied to many forms of technology to perform a useful function, and this experiment aims to see how we can control it.
The lengths of each wire, accurately by clipping the probes of the ohmmeter, will be measured in cm with a 30 cm ruler with an, to the edges of the nichrome wires that are to be. The maximum error bar that can be identified there is the 4th independent variable, which was the 40cm wire, and the minimum error bar was located in the 1st data, which was the 10cm wire. ( y o u c a n u s e t h e m e a s u r 0 1 ; � � � � � � � � � � � � � � � � � � � � � 4 6 � � � t [http://resources.schoolscience.co.uk/CDA/16plus/copelech2pg1.html], “Resistance: Chapter 1 – Basic Concepts of Electricity”. Pre-lab Quiz/PHYS 224 Ohm’s Law and Resistivity Your name _____ Lab section _____ __ 1. The investigation has concluded that there is a clear relationship between the length and the resistance of a wire, and that the former does in fact affect the latter. For instance a 10cm wire has 5 atoms, a 20cm wire has 10 atoms. Measure each wire by putting the points of both probes to the edges of the wires, and measure them four times/trials each. M�.t� .��$�~��� ���� JFIF ` ` �� C �� C�� +�" ��
Have a clear and clear working space for the experiment. When coming to measure those two datas, the datas gained from each trial were very inconsistent, which was presumably caused by the inconsistent rubbing with sandpaper, which will be further elaborated in the suggestions for improvements. An example from the real life world would be LED lights that requires a resistor to control the flow of the electrical current to prevent getting damaged by high electrical current.
There is, however, a scientific explanation behind all this. What do you investigate in this lab?For a piece of material, if its resistance is constant over a wide range of voltage (more accurately, over Do not consume any of the materials used, and keep them away from eyes.
Two data of the largest errors went way above the predicted line, which from it we can infer that the collected data is considered to have an inconsistent precision. Set up the circuit as shown in the diagram. �Іnc�HC�5����:����?�#��ޡO�]0�8cx(;1Xb_�z��c:�)� T�q0AZ. Professional writers in all subject areas are available and will meet your assignment deadline. /Filter/DCTDecode - v v � v v v v v � � � v v v v v v v ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� ���� b v v v v v v v v v � � : Experiment To Measure The Resistivity Of A Wire Equipment: 1m of constantan wire of diameter 0.27 and 0.56 mm, 1m of nichrome wire of diameter 0.27 and 0.56 mm 12 V supply, 2 multimeters Procedure Take one of the pieces of constantan wire and record its diameter in three places using the micrometer screw gauge. Web. ! Get 150cm of nichrome wire and scrap or rub it with sandpaper in order to make it conductive. The said scientist hence came up with a rule for working out resistance, shown on the image on the side: Resistance is an important factor to pay attention to because, one, an overly-high resistance can cause a wire to overheat due to the friction that is caused when the electrons move against the opposition of resistance, which is potentially dangerous as it could melt or even set fire.
v & " H v v � � � � � s � � � � v p � 8 � ! The graph also has an identified slope or gradient of 0.132. A longer wire also means that it would have more atoms, which means it will be more likely for moving electrons to collide with them; hence, higher resistance. Calculate the average. %PDF-1.2 The logical explanation would be that a longer wire also means that it would have more atoms, which means it will be more likely for moving electrons to collide with them; hence, higher resistance. � z | ~ � � � � � � � � � � � � � � � � � � � � � � � � ��`�� ��`�� ��^�� Another aspect from the mathematical function that can be identified is the Y intercept which was 2.3, and it represents the average resistance (dv) of the first data of the independent variable, which was 3.48 Ω. Science Teacher and Lover of Essays. � a � v a � � - � ���� ��A� 5 � � M � 0 % b � b - b !
��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��8��!#�yG��cڦ*�} �l�$���pt�E0��P�(~q�7ɝHz��\�3t5������E>�4�D����~>q�ۅ�hG�r�LP ��E���_ksv�k�A�}c��ːp� ����^�ҥ7! The pattern on the graph supports the hypothesis of the experiment which predicted that if the length of the wire increased, the resistance measured would increase as well, the graph will observe a positive gradient with the mathematical function of y = mx + c which is supposed to display the increasing amount of resistance. [http:// bbc.co.uk/schools/gcsebitesize/design/electronics/calculationsrev1.shtml], “Resistance and Resistivity” N.p., n.d. T h e g r a d i e n t o f e a c h g r a p h w i l l g i v e y o u t h e q u a n t i t y r� �/� �A T h e r e f o r e i f y o u m u l t i p l y t h e g r a d i e n t b y t h e c r o s s - s e c t i o n a l a r e a , t h i s w i l l g i v e y o u t h e r e s i s t i v i t y o f t h e w i r e .
Title Experiment To Measure The Resistivity Of A Wire Author Mark Ian Dixon Last modified by Education Created Date 5/15/2011 8:45:00 PM Company Pre-installed Company Other titles Experiment To Measure The Resistivity Of A Lab Report: Determine The Percentage Of Water In Hydrated Calcium nitrate. 3: (6.50+7.00+6.50+7.90) ÷ 4 = 6.98 Average uncertainty data of no. The resistance of a wire causes difficulty for the flow of the electrical current of a wire to move and is typically measured in Ohms (Ω). Equipment List A lump of Play ¡Doh c, four nails, a voltage supply, two multimeters, a at piece of L e n g t h / m V o l t a g e / V C u r r e n t / A R e s i s t a n c e / W� C a r r y o u t t h e a b o v e p r o c e s s f o r t h e o t h e r c o n s t a n t a n w i r e a n d b o t h n i c h r o m e w i r e s . The datas for the length of wires (independent variable) were 10cm to 50cm with an increment of 10cm between each wire, while the resistance (dependent variable) seemed to display a lowest data of 3.48 Ω and a highest data of 8.48 Ω, which seems to fit well with modelled best fit line graph, which is visibly supported by the coefficient determination (R2) which states that the best-fit line fits the scattered data by 94.98%. &. stream
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Science, English, History, Civics, Art, Business, Law, Geography, all free! This was proven and supported by the trend-line in the graph which basically shows an positive correlation in the increase in resistance in the same rate as the independent variable increases, which is just as the hypothesis predicted. Kinetics Lab Explained: Iodination of Acetone, The Energy of Phase Changes Lab Explained, Determination of Acetic Acid In Vinegar Lab Explained, Energy Content of Food Lab Report Answers, Pip and Joe’s Relationship in Great Expectations, Dulce Et Decorum Est by Wilfred Owen: Poem Analysis, The Manhunt by Simon Armitage: Poem Analysis, The experiment will work with 5 sets of nichrome, Each wire will be measured with an ohmmeter of, wires, starting from the length of 10 cm, added, a multimeter with an uncertainty of ±0.01Ω, with increments of 10cm. < 2018. May 8.
C o m p l e t e a t a b l e a s b e l o w a n d c a l c u l a t e t h e r e s i s t a n c e o f t h e w i r e f o r e a c h l e n g t h . If say 5 electrons try to pass through those two wires, the chances of them bumping into atoms are higher in the 20cm wire than the 10cm one. The graph also manifested a positive mathematical function of y = 0.132x + 2.3 with a positive gradient (0.132x) as well. /Width 501 “Potential Difference” BBC – GCSE Bitesize. Set the power supply to 1V. Article last reviewed: 2019 | St. Rosemary Institution © 2010-2020 | Creative Commons 4.0.
This experiment will be focusing specifically on that last factor – length – and investigate just how much of a role a length of a wire would have on its electrical resistance by using a range of wire lengths to test with.
h�_� CJ h�_� 5�>*CJ h�_� 5�>*CJ h�_� 2 0 1 q � � � � � � ( P ] ^ � � � � � : � � � � E ! If one short wire has a resistance of 1 ohm, then 2 shorts wires would have a resistance of 2 ohms when connected in series.
Put on safety goggles, lab coat, gloves and masks for safety. Therefore, the longer the wire, the higher the resistance.
Doubling a length of a wire is just like having two of the shorter wires in series. George Ohm discovered that the potential different of a circuit corresponds to the current flowing throughout a circuit, and that a circuit sometimes resists the flow of electricity. /Name/Im1
3: (7.90-6.50) ÷ 2 = 0.70.