Investigate the resistance of a wire Essay Example for Free

Investigate the resistance of a wire Essay If the wire is thinner then the electrons have less of a cross sectional area to bounce through, and the wires atoms slow down the free-electrons by impacting them. A similar scenario occurs if the wire is hot, as the wires atoms vibrate more and these reverberations also impact the free-electrons slowing them down. Resistance is clearly far less in the opposite situation to both of these scenarios. Other possible scenarios have been briefly mentioned in the Affecting Factors section. Repeated readings In this experiment I have decided that during the final experiment, I shall take repeat readings. I have decided this as during the preliminary investigation, I have noticed that several readings are easily anomalous. If I should combat any erratic figures during the final experiment I can rely on a second set of readings, therefore making the experiment more of a fair test. It is to this effect that I believe repeated readings necessary and I shall take two sets of reading for each voltage experimented on. Background information During the course of the academic year, I have conducted an experiment to prove Ohms law of resistance, voltage and current. This law associates all three of the aforementioned units in a simple equation: Voltage = Current x Resistance or V=IR This proved that as voltage and current increased, so did the resistance of the wire. This is one of the many ideas that I base my hypothesis of the experiment on. Prediction I predict that in my final experiment, as the voltage increases, so will the current. I believe this as voltage is said to be the pushing force or drive behind the current and so the higher the voltage is, the faster the flow of electrons in the wire. I also predict that higher than 8V the wire will burn. I believe this as whilst investigating my preliminary experiment, the wire burnt quickly on a voltage of 8V or thereabouts. I predict that the shorter the wire becomes, the higher the voltage and current of that wire, I believe this because the shorter the wire becomes, the lower the resistance becomes as the free electrons in the circuit would have far less atoms in the Constantan wire to impact against subsequently lowering the resistance. I also believe that the higher the voltage and lower the current, the higher the resistance will be, I have concluded this from ohms law. Also I predict that the higher the voltage and current on a short length of wire, the higher the possibility of mass temperature rise and therefore open flame. This would ruin the experiment so as I have said before I shall only be using voltages less than and including 6v. Final experiment During this section of the investigation, using newly discovered knowledge from my preliminary experiment I shall aim to collect a set of accurate results to match my hypothesis. Apparatus During this experiment I shall need: A digital ammeter A digital voltmeter A Constantan wire A power pack Sets of power leads 100cm ruler Crocodile clips Diagram Method The apparatus was set up as shown in the diagram. The Constantan wire was mounted onto the ruler, and attached by both selotape and crocodile clips (one at 0 on the ruler, the other one was moved up and down the scale in order to change the overall length of wire included in the circuit) The readings were taken from both the ammeter and the voltmeter in two sets for each voltage. The readings were taken at a constant variation of 10 cm from 100cm to 20 cm (I havent taken any readings less than 20 as in the preliminary this tended to burn the wire) I took readings in three different voltages namely 2volts, 4volts and 6volts. Results 2 volts, first set Length of wire, cm Current, A Voltage, V Resistance, ? 100 0. 39 1. 83 4. 69 90 0. 41 1. 76 4. 29 80 0. 45 1. 74 3. 86 70 0. 48 1. 69 3. 52 60 0. 56 1. 65 2. 95 50 0. 61 1. 50 2. 46 40 0. 73 1. 46 2. 00 30 0. 92 1. 36 1. 48 20 1. 22 1. 19 0. 98 Graph 2 volts, second set Length of wire, cm Current, A Voltage, V Resistance, ? 100 0. 37 1. 85 0. 20 90 0. 41 1. 81 0. 23 80 0. 45 1. 77 0. 25 70 0. 50 1. 72 0. 29 60 0. 60 1. 74 0. 34 50 0. 66 1. 63 0. 40 40 0. 78 1. 52 0. 51 30 0. 94 1. 38 0. 68 20 1. 27 1. 25 1. 02 Graph 4 volts, first set Length of wire, cm Current, A Voltage, V Resistance, ? 100 0. 78 3. 80 0. 21 90 0. 85 3. 72 0. 23 80 0. 94 3. 65 0. 26 70 1. 05 3. 57 0. 29 60 1. 18 3. 45 0. 34 50 1. 36 3. 33 0. 41 40 1. 60 3. 17 0. 50 30 1. 89 2. 76 0. 68 20 2. 75 2. 62 1. 05 Graph 4 volts, second set Length of wire, cm Current, A Voltage, V Resistance, ? 100 0. 79 3. 84 0. 21 90 0. 86 3. 74 0. 23 80 0. 95 3. 68 0. 26 70 1. 07 3. 60 0. 30 60 1. 21 3. 50 0. 35 50 1. 38 3. 34 0. 41 40 1. 58 3. 06 0. 52 30 1. 94 2. 84 0. 68 20 2. 58 2. 67 0. 97 Graph 6 volts, first set Length of wire, cm Current, A Voltage, V Resistance, ? 100 1. 09 5. 29 0. 21 90 1. 19 5. 20 0. 23 80 1. 35 5. 15 0. 26 70 1. 50 5. 10 0. 29 60 1. 72 4. 96 0. 35 50 2. 00 4. 90 0. 41 40 2. 38 4. 61 0. 52 30 2. 83 4. 36 0. 65 20 3. 75 3. 70 1. 01 Graph 6 volts, second set Length of wire, cm Current, A Voltage, V Resistance, ? 100 1. 09 5. 26 0. 21 90 1. 20 5. 22 0. 23 80 1. 32 5. 13 0. 26 70 1. 49 5. 04 0. 30 60 1. 68 4. 91 0. 34 50 1. 95 4. 76 0. 41 40 2. 19 4. 30 0. 51 30 2. 70 3. 96 0. 68 20 3. 75 3. 80 0. 99 Graph Analysis From the graphs above, it is clear that the resistance between varying voltages are very similar. As the voltage and current have increased the resistance has increased, as I have previously stated in my prediction, therefore Constantan wire obeys ohms law of resistance. The increase in resistance is due to more and more energy being put into the wire. That is to say as the voltage or the driving factor behind the free electrons flowing around the circuit increases, this increase in resistance is caused by the free electrons being passed around the circuit at much higher speeds and therefore deflecting off of more atoms that have more heat energy than those in shorter lengths of constantan wire. These atoms are hotter because more free electrons are passing through these lengths of wire, and deflecting off of more atoms, passing their kinetic energy to these atoms as heat energy. This is what causes the wire to heat up, and sometimes melt. During taking these results I have noticed that there are several linking factors. These are mainly current and voltage, as stated in ohms law. Evaluation I believe that my experiment in all is accurate for a GCSE standard coursework piece, although in research physics I believe that this experiment would be highly inaccurate. I do not believe that any of my readings are abnormal. From my work mostly from the average set of results taken from all 6 sets, I can conclude that: * Resistance in a wire is equal to the voltage divided by the current of the circuit * With high voltages, the wire in the circuit heats up due to an increasing number of collisions of free electrons and atoms in the Constantan wire. * As a wire decreases in length, the resistance increase * As a wire increases in length, the resistance increases as does the voltage however the current decreases * Constantan wire obeys ohms law During the experiment I noticed several abnormalities however. If I had the power pack on for too long a period of time, the readings on both ammeter and voltmeter began to become more and more erratic. I believe this to be because the apparatus was not turned off, heat would have been building up in the Constantan wire so during the experiment I turned off the apparatus between readings. After I did this I noticed that this strange behaviour had stopped. I also realised that using a rule and crocodile clips was clearly not the greatest means of measuring the length of wire as the lengths would clearly have not been at all accurate, and that the likelihood of using the exact amount of wire in the circuit was far outweighed by that of not doing so. In the graph which I associated length of wire with resistance, it clearly showed a straight line through the origin (0,0). This line represents the phrase proportional to therefore I also conclude that length of wire is proportional to the resistance of the wire. Improvements My work in this final experiment is far improved from that of my preliminary although it could easily still be improved further. I would improve it further by using more accurate means of measuring the voltage and current of the circuit, I would use various types of wire, I would vary the temperature of the wire and I would vary the cross sectional area of the wire. In this experiment, although I only varied the length of the wire, unwittingly I also have changed the temperature of the wire, as it increases as any current is passed through it, and as the shorter the subject wire becomes the hotter it also becomes. I would strive to collect resistance readings that were the same throughout the experiment as mine varied slightly. Reliability I believe that my results are viable for a GCSE standard piece of coursework although a research physician would discard them. I believe that collecting answers to two decimal places is also accurate enough for this experiment and that the slight variations of resistance between repeats is so small that the results could be deemed accurate. Constant factors In this investigation I have strived to make sure that the following factors remained constant: * Cross sectional area * Temperature of wire * Type of wire In this investigation, the cross sectional area or CSA would be maintained throughout readings, as the wire was not swapped during the experiments. This reason also dictates that the type of wire is also a factor that was kept constant. As I have mentioned before the temperature of the wire would have varied throughout the experiment, and as I have mentioned in the preliminary section of this investigation that with voltages higher than 8v the wire began to burn. This deviation in the temperature may have been the deciding factor as to why my readings for resistance were only slightly different. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section. Download this essay Print Save Not the one? 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Australian Vocational Education and Training Essay -- Australian Educa

This essay discusses on the Australian vocational education and training (VET) as a formal learning system that is intended for out-of-school youth who are past secondary education. It explores the drivers that shape the economic, social and political contexts in which VET was established like human capital theory, changing nature of work, globalisation, lifelong learning and the learning society. The paper analyses and evaluates the VET strands and mode of delivery and argues that VET is a good channel for out-of-school youth to be mainstreamed to the job industry but the mode of delivery is not sustainable. The experiences of VET practitioners interviewed and the researches on disengaged learners and reasons of early leavers were used to support the argument. It also explains the impact of VET had on my institution and the implication on my teaching practice using the concepts of reflexive modernisation, globalisation and lifelong learning. The formal education system in the Australia is divided into three levels: (i) basic education which is handled by the Department of Education (DepEd), (ii) technical/vocational which is handled by Technical Education and Skills Development Authority (TESDA), and (iii) higher education which is handled by Commission on Higher Education (CHED). In addition, there is a preschool level and a non-formal component that provides basic literacy and livelihood skills to out-of-school youth and adults who have either not attended school at all or who dropped out of school early. Basic education, which usually starts at age six, is divided into 7 years of primary schooling and 5 years of secondary schooling. TESDA provides pre-employment preparation in middle-level technician and craft skills. At the... ...ok of readings. And, this time I made use of NCVER which is indeed a very good resource for teachers of adult education. Lastly, I conferred with my mentor as regards to this assignment because she is directly involved with VET and interviewed VET practitioners for me. The part of my assignment I consider the weakest would be the implications of VET in my teaching practice because I know I need to substantiate my explanation on the identified implication however perhaps because I am not directly involved with VET I cannot really reflect on how I should view my teaching practice. On the other hand, the part of my assignment that I consider the strongest are the three arguments I discussed against VET mode of delivery because I was able to back up my arguments with researches, concepts and experiences of VET practitioners to stress my point.

: Supply Chain Management Is Primarily of Interest to Manufacturing Firms

Overview Supply chains are networks of organisations, information, technologies, activities and resources involved in the movement and conversion of physical goods or services from suppliers to end consumers. These different organisations are interlinked by physical, information and monetary flows. Organisations create value by transforming raw products into finished goods or repositioning of resources thru space and time, which is based on networks of supply chains. Both ways, it involves the movement and conversion of physical goods and information throughout supply chains across the world.Therefore organisations and supply chains are closely interlinked in the creation of value for its customers. Manufacturing firms produce goods for use or sale using labour, machines, technology and other materials usually on a large scale. Processing of materials into products takes place in a factory or manufacturing plant where the organisation’s labour and machines work in unison to tr ansform raw material into a usable product, or using many components and process it into a finished product for the end consumer, just like how a baker is able to transform flour to bread thru labour, skill, machinery and tools.Supply chain management for manufacturing firms To achieve economies of scale, manufacturing firms needs to produce their products on a large scale. Generally the higher the production output of the firm, the lower the unit cost of their product will be. Besides output volume, the speed of production will determine the lead time from manufacture to delivery. High productivity will enable manufacturing firms to achieve shorter production cycles which equates to better competitiveness in their respective markets.Capacity management will determine how efficient the manufacturer will be in producing its goods. Over capacity will result in increased wastage and costs while under capacity will see the firm lose certain profits that it should gain. Thus manufacturer s needs to carefully consider the type and amount of capacity needed for its production when doing its supply chain planning. The timing of capacity changes also needs to be taken into consideration to achieve maximum efficenty given that demands of their products varies with seasonal changes.The ability to react to market demand changes quickly will determine manufacturers flexibility in keeping up with these demands. Manufacturers needs facilities to produce, whether warehouses to store its raw materials or finished goods, or manufacturing plants to produce their products. Services facilities are needed by certain manufacturing industries such as consumer electronics to cater for returns. Distribution centres also determine the efficenty of production distribution and un-nesessary inventory holding will result in higher holding cost.Such facilities require large investments and are integral of the manufacturer’s supply chain strategy and thus proper planning is needed when making these decisions regardong the size, location which affect the overall operations. How manufacturers run their productions also determine how successful will they be in terms of productivity and quality levels. Different types of equipment and processes also affect the cost and output of the manufacturing plant.Information systems that flow both upstream and downstream affects the forecasting, planning, inventory and production levels, they must be robust to ensure the manufacturing firm is able to react accordingly to changing demands and variations. In addition to their internal environment, manufacturing firms needs to consider procurement as an integral part of their supply chain strategy, supplier selection will affect the cost and how the manufacturer will run its production and ultimately affects the whole supply chain. Transportation systems as part of the supply chain plays an equally important role for manufacturing firm’s success.To reduce inventory holding l evels many manufacturing firms are running on a lean basis where they practice Just-In-Time delivery to meet production schedules. Transportation networks to customers have to be equally efficient to reduce lead time in accordance to lean manufacturing. Many manufacturing firms leverage supply chains to achieve competitive advantages in their markets. the case study on Procter & Gamble (Bozarth & Handfield, 2006: Pg 91-92) is a good example of how a manufacturing firm leverages on their supply chain to improve on their effectiveness and lowering cost.Procter & Gamble used to operate under five different business sectors according to different product lines such as paper goods and healthcare products in the mid 1990s. Originally this makes good sense to Procter & Gamble to better manage its’ diverse business. However for the retailers and customers of Procter & Gamble who is purchasing with all the different five entities, it also meant different order processing, invoicing an d deliveries when at the core the five entities are all under the same company.For Procter & Gamble it also a logistical nightmare as they faced issues with high volume of orders which resulted in errors, inefficient deliveries with many trucks delivering to the same customer with less than truckload full and inefficient invoicing by the different entities to the same customer. After Procter & Gamble redesigned the information and physical flows across their five entities, their customers only need to deal with one entity for all its product range and logistical process.The end result is a win-win situation where Procter & Gamble increased its profitability through cost savings and increased customer satisfaction. Their customers also gained with the efficient processes and they are also able to enjoy volume discounts from consolidated orders across their product range. Summary In order to excel, manufacturers might need to produce high variations of products, produce in large volum es to meet economies of scale, be flexible enough to meet the volatile markets demands and run a lean and efficient supply chain to save costs and reduce wastages.In view of such, supply chain management to manufacturing firms are of utmost importance if they wish to compete in today’s ferociously competitive markets. Besides making and selling a product, manufacturing firms need to manage and leverage on supply chain strategically in order to gain competitive advantages. As a result of globalisation and rapid technological changes, manufacturing firms needs to constantly focus on supply chain management to align their internal operations with their external environments.

Essay on The Influence of Aristotle - 1294 Words

Aristotle is considered by many to be The Fountainhead of modern scientific thinking. The forces that influenced Aristotle, is perhaps better understood on a historic basis has been laid. The Greek thinkers around 600 BC, began to interrupt the world around them as governed by anything other than his many personifications of gods and they took in a naturalistic way of thinking, which in turn was to the early science. This may have been sparked by their enthusiasm for travel abroad, which may have made them skeptical of their traditions.2 Thales (ca. 640-546 BC) of Miletus is regarded to have been the founder of natural philosophy, and believed that all things come from water, and that the Earth floats on water. From the time of Thales on,†¦show more content†¦This principle can be taken a step further, to explain the biology, to say that the organs of the body work together to keep the organism as a whole.5 Further, Aristotle believed that human biology can not be understood except through surveys of similar creatures6 Biological principles were heavily influenced by Aristotle. William Harvey, the founder of modern physiology was strongly influenced by Aristotle and ... founded much of his work on the Aristotelian assumption that the shape, structure and size of each organ in the body the animal indicated its purpose and function of the entire system. 7 The idea of spontaneous generation was a commonly held belief, with roots back to Aristotle8 and was not disproved until experiments were conducted by Louis Pasteur.9 Aristotle influenced Sigmund Freud, and while he studied at the university he studied Aristotle in three years and later added a course on Aristotles logic. Aristotle believed that the human mind given us a picture of the outside world, and that truth is in our eyes. Moreover, our first instance of science experience and that happiness is found through reflection. Aristotles view of organization, the higher levels include the lower levels is a way to begin to understand some of Sigmund Freuds theories, such as libido theory and the supremacy of the genitals. Freud, as Aristotle might have matter and form. EarlyShow MoreRelatedAristotle s Influence On Democracy1561 Words   |  7 PagesAthenian citizens because, despite strong evidence negating their arguments, the common people blamed him for corrupting the city’s youth. Aristotle would later argue in his writings that the most effective democracy should include equal power between the rich minority and the poor majority, so the poor could not take advantage of the rich. 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