Resistance investigation Essay Example for Free

Resistance investigation Essay Resistance is the opposition to current and voltage within a given material. George Ohm discovered the concept of resistance in 1826. He stated that the current flowing through a wire is proportional to the potential difference across it as long as the temperature remains constant. The formula to calculate resistance is Resistance (measured in Ohms)= potential difference across a wire (volts) Current through a wire (amps) In this investigation we are going to find out how resistance changes in relationship to when the length of a wire is changed. We will take readings every 10 cm because this should give a substantial variation in the readings and go up to 100 cm because this will give us a sensible set of results to work with. To ensure that the experiment is safe we will have to clear the work area and make sure that it is clean and dry, and keep the current low, in this case two volts. I predict that as the length of the wire increases the resistance will also increase in direct proportion, as there will be more particle collisions in the longer wire. In addition the free electrons in the outer shell have to carry the charge further, which also increases the chances of collision. To make the experiment a fair test we will use 2 volts throughout and include a switch in the circuit, which will enable us to control that the circuit is only on when we are taking readings. It will therefore obey ohms law, as the temperature will remain cool, and the cross sectional area of the wire will also remain the same. We will keep the same apparatus throughout the experiment and will take more than five sets of results to ensure that we have a good statistical average. The only thing that we will change is the length of the wire. The apparatus we will need in the experiment are a power supply, wires, a switch, a 1metre ruler, a voltmeter and an ammeter. Results These are the sets of results that I obtained: Distance (cm) Voltage (v) Current (a) Resistance (ohms). From these results we have found out that as the length of a wire increases so does the voltage and resistance, whereas the current reduces. The data shows that the distance of a wire does have an effect on the resistance through it. This is because as the length of the wire increases the likelihood of collisions between the nucleus of the atom and the electron which carries the charge increases. On the graph the line of best fit shows that that there is a good correlation of the data showing that there is a direct and proportional relationship between the length of a wire and the resistance. This proves that my original prediction correct that the resistance of a wire will increase as the length does. Evaluation The method used for the experiment worked well and we were able to gain the results needed to make a conclusion. The accuracy of the data was on the whole good but there were two odd results. These were anomalies as the resistance was lower on average than the resistance from the reading taken from a 10 cm shorter wire. The method for the investigation was well suited to the experiment. To improve the reliability of the results we could keep the room temperature constant, and be more accurate in measuring the length of the wire. We could also use more accurate voltmeters and ammeters. Due the close position of the points plotted on the graph there is enough accurate information obtained from the results to support the definite conclusion that as the length of the wire increases so does the resistance. To improve the results we could repeat the experiment but take readings at different or more frequent intervals . We could also take more sets of results.

Personal Narrative- My Dream Essay examples -- Personal Narrative Writ

Personal Narrative- My Dream I picture myself center stage in the most enormous and fantastically beautiful theater in the world. Its walls and ceilings are covered in impeccable Victorian paintings of angels in the sky. A single ray of light shines down upon my face, shining through the still, silent darkness, and all attention is on me and me alone. The theater is a packed house; however, my audience is not that of human beings, but rather the angels from the paintings on the walls come alive, sitting intently in the rows of plush seats. Their warmth encompasses my body, and I know at that moment that it is time to begin. I open my mouth. From deep inside my soul a melody flows out of my chest, off of my tongue, and finally caresses my lips with the sweetest touch, and my song fills the air with a boldness like that of the glory of the angels. The sound of my song is that of unfathomable wonder, a voice as sweet and smooth as the face of a child. I sing and sing and sing my heart out, and I wonder and wonder and wonder in awe of the sound that is coming from my mouth and my...

Ideological Framework

The Ideological Framework Economic prosperity spawned discontent when the native beneficiaries saw a new world of affluence opening for themselves and their class. They attained a new consciousness and hence, a new goal – that of equality with the peninsulares – not in the abstract, but in practical economic and political terms. Hispanization became the conscious manifestation of economic struggle, of the desire to realize the potentialities offered by the period of expansion and progress. Hispanization and assimilation constituted the ideological expression of the economic motivations of affluent indios and mestizos. Equality with the Spaniard meant equality of opportunity. But they did not realize as yet that real equality must be based on national freedom and independence. The were still in the initial phases of nationalist consciousness – a consciousness made possible by the market situation of the time. The lordly friar who had been partly responsible for the isolation of the islands became the target of attacks. Anti-clericalism became the ideological style of the period. [p. 134] These then were the salient economic and ideological features of Rizal's time. A true historical review would prove that great men are those who read the time and have a deeper understanding of reality. It is their insights that make them conversant with their periods and which enable them to articulate the needs of the people. To a large extent, Rizal, the ilustrado, fulfilled this function, for in voicing the goals of his class he had to include the aspirations of the entire people. Though the aims of this class were limited to reformist measures, he expressed its demands in terms of human liberty and human dignity and thus encompassed the wider aspirations of all the people. This is not to say that he was conscious that these were class goals; rather, that typical of his class, he equated class interest with people's welfare. He did this in good faith, unaware of any basic contradictions between the two. He was the product of his society and as such could be expected to voice only those aims that were within the competence of his class. Moreover, social contradictions had not ripened sufficiently in his time to reveal clearly the essential disparateness between class and national goals. Neither could he have transcended his class limitations, for his cultural upbringing was such that affection for Spain and Spanish civilization precluded the idea of breaking the chains of colonialism. He had to become a Spaniard first before becoming a Filipino. [8] As a social commentator, as the exposer of oppression, he performed a remarkable task. His writings were part of the tradition of protest which blossomed into revolution, into a separatist movement. His original aim of elevating the indio to the level of Hispanization of the peninsular so that the country could be assimilated, could become a province of Spain, was transformed into its opposite. Instead of making the Filipinos closer to Spain, the propaganda gave root to separation. The drive for Hispanization was transformed into the development of a distinct national consciousness. Rizal contributed much to the growth of this national consciousness. It was a contribution not only in terms of propaganda but in something positive that the present generation of Filipinos will owe to him and for which they will honor him by completing the task which he so nobly began. He may have had a different and limited goal at the time, a goal that for us is already passe, something we take for granted. However, for [p. 135] his time this limited goal was already a big step in the right direction. This contribution was in the realm of Filipino nationhood – the winning of our name as a race, the recognition of our people as one, and the elevation of the indio into Filipino.

The Weaknesses, By Don t Allow The Children - 931 Words

The weaknesses, however, don’t allow the children to explore with their ideas. They don’t get the chance to participate in extra curricular activities, and they miss opportunities to develop skills outside of academics. Progressivism Progressivism holds many of the same values that Essentialism does. In fact, they are commonly grouped together in education. John Dewey founded progressivism during the progressive era. Dewey saw schools, â€Å"with its rows of ugly desks placed in geometrical order, crowded together so that there shall be as little moving, room as possible, desks almost all of the same size† (Page 220). Dewey didn’t want children to feel like school was another day at the factory; he wanted children to be able to participate in their education instead of just listening. He believed that ordinary people could make a difference in society if they were given an appropriate education. Dewey said, everyone is changing therefore everyone must adapt to their surroundings. He wanted education to be taught based on what worked for the current generation not based on what had worked in the past. If being taught in a progressive education classroom each student can be expected to be the main fo cus of the room. Progressivism is a child-centered curriculum, which is peer-centered and growth-centered. The students were thought to have learned best by engaging in the discussion instead of just sitting and listening. Dewey believed that education should be, â€Å"based on whatShow MoreRelatedHow to Crack a Website1314 Words   |  6 Pagesif the computer you use to run your online business is the same one your children use for homework and general surfing, this is potentially a very dangerous situation. A recent security survey reported that 20% of home PC s are infected with viruses and over 80% contained spyware and adware. Frightening figures. The following are a few anti-hacking tips that will help in keeping your business systems secure. 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