Investigating Resistance Essay Example for Free

Investigating Resistance Essay Plan of Action I am going to find out what affects the resistance of a wire by using a six volt power supply in order to have a sufficient charge that wont be too strong or too weak, also so the wires wont get too hot very quickly as it would then greatly affect our results. Five different thickness of nichrome wire as well as changing the length. I will use 20,24,28,32 and 36swg and for each one I will record the voltage and the amps for the lengths from 100cm, down every 20 to 20cm. Do this by setting up the equipment as shown in the diagram below and change the wire after you have recorded all the results for the previous wire, doing so for each one: We will then use the results to find the resistance which is: R=V Resistance = Volts I Amps I will then record our results on a graph. After that I will do the same thing but record all the wires at 60cm three times to do an extra graph comparing cross-sectional area and resistance. Trial run Below is a results table showing our first trial run of our plan of action so we can see if anything needs changing. The wire used was nichrome-24swg. LENGTH (CM) V VOLTS I AMPS R RESISTANCE V2 I2 R2 V3 I3 R3. The results do prove my prediction correct but to show it accurately I will change my plan of action to going down in 10cm rather than 20cm. This will give me a wider range of results. Improved Plan of Action I am going to find out what affects the resistance of a wire by using a six volt power supply, five different thickness of nichrome wire and the changing of length from 100cm, down every 10 until I get to 10cm. The thickness that I will use are 20, 24, 28, 32 and 36swg. For each thickness I will record the Volts and Amps from 100cm down to 10cm. I will do this by setting up a circuit like the one below and changing the wire after I have recorded all the results for the previous wire: I will the use the results to find the resistance for each length of each wire using this equation: R=V which is . Resistance = Volts R Amps I will then do the same as the above but only record all the wires at 50cm three times to compare cross-sectional area and resistance. Then Ill do the graphs. Apparatus . Power supply, to supply the charge for the wires. . 5m of nichrome wire, for the charge to travel through. . crocodile clips, to connect the circuit. . wire cutters, to cut the wire down to the desired lengths. . metre stick, to measure the different lengths of wire. . connecting wires, to carry the electric current. . ammeter, to record the amps. . voltmeter, to record the volts. Fair Test I will make sure it is a fair test by using the same bit of wire when we record the 50cm three times, letting the wire cool down before moving on to the next length because heat creates more resistance, use the same amount of power for each wire so there are the same amount of electrons passed into the wire each time. Also I will make sure the circuit is connected properly at all ends. Method . Set up equipment as shown in diagram. . Cut a 20, 24, 28, 32, and 36swg nichrome wire to 100cm using a metre stick. . Start at 20swg and add it to the circuit. . Start at 100cm record the results and move the crocodile clip down 10cm. . Record the results from the ammeter and the voltmeter onto a table. . Move the crocodile clip down 10 more cms and so on until you get to the end. . Change wire to the next gauge and gradually work your way through all of them. . Repeat the 24swg three times at all lengths. . For all the thickness record the results three times at 50cm. . Then find the resistance using the equation R=V/A . Plot the graphs. Safety Box . Make sure bags and coats are in a safe place where nobody can fall over them . Walk in an appropriate manner around the laboratory. . Leave the wires to cool before touching them . Do not take water near the power pack and dont have the voltage too high Results Nichrome-20swg Length (cm) V volts I amps R resistance Nichrome32swg Length (cm) V volts I amps R resistance Nichrome-36swg Length (cm) V volts I amps R resistance Evaluation My results show that the longer a wire is, the higher the resistance will be and the thicker a wire is, the lower the resistance will be. This is what I predicted and it has been proved. The resistance in a wire depends on its shape and size. The scientific reason as to why thin wires have a higher resistance than thick wires is that the sea of electrons that flow throughout a metal all travel through at the same time and if the electrons have a larger area to travel through then there will be more space for them to flow freely with less collisions that cause loss of energy, but if they try to flow through a thin piece of metal they will collide into the other ions creating heat which then creates more resistance. Longer wires have more resistance than shorter ones because a short wire has a certain amount of resistance, now if you double the length of the wire then you will also be doubling the resistance. This is because there is a greater distance for the electrons to travel through so there is a greater amount of resistance slowing the current down. The graph comparing length and resistance shows a linear trend, but I think we may have made an error in the experiment. I think this because the line for the 32swg wire is above the line for the 36swg wire when they should be the other way around. I suspect that we may have used the same wire accidentally because the points for each result are so close, but generally speaking the theory is proved because all of the others have followed the expected pattern of an increase of resistance, in the increase of length and the increase of thickness. The graph comparing cross-sectional area with resistance shows that with each increase in width of a uniform nature, the resistance drops, but by a greater amount each time, i. e. 32swg-10 28swg-5 diff-5 24swg-2 diff-2 20swg-0. 9 diff-1. 6 If I was to do the experiment again then I would improve my method by being more accurate with my measurements of the wire. The problem with the measurements before was that the wires were very bendy and hard to straighten out so as a result the wires would have been longer then the actual length recorded, so I would use straight wire and would make sure it was cut to the nearest mm to get more accurate results. Overall I am quite pleased with my experiment. The results were generally successful and prove my prediction and the theory correct. If I could do it again then I would make sure I had all the correct wires for each experiment, and that the wires werent too hot as to affect the results in a major way by creating too much resistance. I would do this by leaving a longer period of cooling time so the heat will escape and the resistance will drop. There was two anomalous results on the graph comparing length and resistance. The reasons for these could have been an accumulation of not holding the crocodile clips at the right places, e. g. At 50cm instead of 60cm, or the connections that sent the current through the wire may have been held on tighter on one of the distances resulting in a stronger current and less resistance, and loser on the next resulting in a lower current and more resistance.

Conditions that Influenced Sino-Soviet Involvement in the Vietnam War :: Vietnam War Essays

Conditions that Influenced Sino-Soviet involvement in the Vietnam War In 1954 the Communists in North Vietnam reached a turning point in their history. The French defeat at Dien Bien Phu was a turning point in the history of this country. Free from the oppression of foreign countries the Communists of the DRV were freed to turn their attention to the task at hand; the infiltration and subjugation of South Vietnam. The influence that both China and the Soviet Union had on this fledgling government was substantial. Without the necessary material, logistics, and support the Communist victory in South Vietnam would never have come about. This paper looks to examine the motives that both the Chinese and Soviets had in their commitment to supporting the DRV in the Vietnam War. In dealing with the motives of both China and the Soviet Union it is also important to keep in mind the conditions of the world in this time period, 1950-1975. Both foreseen and unforeseen events would alter the respective policies of each country. In observing these events, this paper will take a chronological prose; history will be dealt with as it was made. In this style of analysis it is possible to shed some light on a seemingly confusing array of foreign policy's that even till today are hard to rationalize. China and the Soviet Union altered their obligation and support levels to North Vietnam according their policies and the history that those decisions produced. The United States will provide a backdrop to the Sino-Soviet involvement in Vietnam. This will provide insight into the relative positions that China and the Soviet Union took in North Vietnam. To both of these countries the United States represented 'the other side'. This is to say that the ideologies of both socialist countries depicted America as the opponent. In ideology this is true; capitalism was the precursor to a more egalitarian socialist society. This was to prove more so for the Chinese Communists, but that will be explained later. It is safe to say that both countries were able to rationalize their actions by telling the world they were defending one of their 'brothers' from an imperialist power. When making reference to the United States as the 'other side' it is crucial to remember that this analogy is only relative to the shifting relationship that each country would experience with the U.S. as the Vietnam War escalated.

The Scarlet Letter: Themes Alive Today

Mike Esposito Mrs. Forstrom American Literature – 1 7 November 2012 The Themes Are Still Alive Today Ah The Scarlet Letter, whether we like it or not, it is now a book we have all read and have most likely come to hate. Whether it be because of the old setting in the Puritan Massachusetts Bay Colony in Boston that we cannot relate to or the old English language in which it is written, Nathaniel Hawthorne just failed to create a novel that most teenagers of the early twenty-first century can enjoy and appreciate.It must be pointed out that first, it’s doubtful he cares, and more importantly that this just simply should not be the case. We juniors should pay more attention to the novel, especially with the thought that the messages Hawthorne tries to convey are still relevant today. Think about it. With all of the experiences of Hester Prynne and other characters in the novel, we interpret concepts that are still correlated with those of today.In Hawthorne’s the Sc arlet Letter, two crucial themes of sin and what it can do to people and the different degrees of evil directly relate to today’s society and modern ideas. As it is known, Hester committed a sin in the novel with Reverend Arthur Dimmesdale that the Puritans in her society thought to be one of the worst that could ever be committed: adultery. They conceived a child together, their daughter Pearl, which is a sin that takes a toll on both characters in many different ways.Beginning with Hester, the protagonist, the sin is something that identifies her, and she becomes one with it. At the beginning of the novel, you should recall that she has to take her first punishment of being humiliated on the scaffold and ridiculed by many people of the community while wearing the letter â€Å"A† on her chest to indicate that she committed adultery. But she does not just stick any regular printed letter on her.She goes beyond, as Hawthorne describes, â€Å"But the point which drew al l eyes and, as it were, transfigured the wearer—so that both men and women, who had been familiarly acquainted with Hester Prynne, were now impressed as if they beheld her for the first time—was that Scarlet Letter, so fantastically embroidered and illuminated upon her bosom. It had the effect of a spell, taking her out of the ordinary relations with humanity and enclosing her in a sphere by herself† (51-52). Hester makes the Scarlet Letter so beautiful because it is a part of who she is and it determines her identity.Also, throughout the book, Hester shows she accepts her sin, especially through the fact that she wants to stay in Boston instead of leave to go elsewhere. She does this because she does not want to pretend that the situation never happened and deny a part of who she is. This tremendously demonstrates the message that sin can give someone fortitude. In addition, forgiveness is something that can also result of sin. This is demonstrated very creative ly through the changing of the letter A on Hester’s shirt.It first symbolized the sin she committed, but later in the novel, changes to mean other positive things, such as â€Å"able† and â€Å"awe†. The change of what the letter means shows that her sin was made up for and that she is forgiven. However, in complete contrast to Hester is Dimmesdale, the father, who shows what can also result from sin. No one ever finds out that until late that he was on the other end of the affair with Hester, which was not a good thing for Dimmesdale. Throughout the novel, his psychological turmoil worsens as he unintentionally inflicts his own punishment of self hatred and guilt.He gets vitally ill and sicker as time progresses, which is reinforced with him always having his hand over his heart. One night his agony and remorse sleepwalks him to the scaffold that Hester was embarrassed on years earlier, as Hawthorne words it, â€Å"he had been driven hither by the impulse of t hat Remorse which dogged him everywhere† (144). This clearly portrays the message of hiding a sin can be too much to handle and can destroy a person. Now that the theme of the different things sin can lead to is discussed in The Scarlet Letter, let’s relate it to our life.As the Christian religion will preach, everyone in the entire world sins all the time. Whether the sins are small or really serious, they are a part of our life all the time, and mostly those that are seriously poor decisions can have a great affect on us. As is illustrated with Hester in the novel, those poor choices can be made up for and can give us strength in our later life. For example, steroid use in baseball is a very popular issue. Ryan Braun, outfielder in the MLB, was suspected to have used performance enhancing drugs after a failed urine test.Clearly, taking steroids was a bad choice for him to make, and although it is not commonly thought of as one, it is a sin. However, Braun came back th e next season after the scandal and had a career year. He recognized his mistake and came back stronger than ever, which is quite relatable to Hester and how her sin made her bold. Also, on the other side, sins can lead people today into having too much guilt to be able to handle, no matter how venial or mortal the sin may be. You may lie to your parents and just not be able to hold back a confession because you feel bad.Or, it may be as serious as a murderer who could not live with himself anymore and turned himself in. Whatever the case may be, what Hawthorne wrote about sin in the 1800’s in The Scarlet Letter still relates to aspects of life today. Roger Chillingworth, that doctor that we know and love, presents another major theme in the novel: there are many levels of evil. As we know, Chillingworth was the husband of Hester before she had the affair with Dimmesdale, which obviously is an evil to the Puritans of the colony.One of the details that you may have missed is t hat the marriage between Chillingworth and Hester was arranged, and that she had no say in it. On a side note, Chillingworth was about double Hester’s age, which makes the marriage worse, and kind of gross. But this plays a role in that Hester more likely committed the sin because she wasn’t really in love with Chillingworth, and was with Dimmesdale. This is the justification of her doing what she did. And in addition to the evils that Hester and Dimmesdale carried out, Chillingworth also does.You should remember that as Dimmesdale was sick, Chillingworth, the â€Å"brilliant acquisition†, was chosen to be his doctor and he had to try to save the colony’s well loved minister. As he did this, he suspected something interesting going on with Dimmesdale, and he figured out that he was involved with Hester and realizes his suspicions are correct. So instead of curing him, he begins to torture the minister. This act of malice is definitely more widely consider ed evil than the acts of Hester and Dimmesdale to us, which is exactly what Hawthorne wants us to think.He demonstrates the theme bluntly in Dimmesdale’s speech to Hester when he talks about Chillingworth’s evil, â€Å"There is one worse than even that polluted priest! That old man’s revenge has been blacker than my sin. He has violated, in cold blood, the sanctity of a human heart. Thou and I, Hester, never did so! † (191). Hawthorne clearly wants you to realize that the evil found in Hester and Dimmesdale’s lovemaking is not nearly as bad as evil in its most poisonous form of the cruel revenge taken by Chillingworth.Evidently, the theme of different levels of evil is clearly presented in the novel, but it also occurs in real life. It is a very upsetting fact, but it is true: evil has not gone away. It existed in the eighteenth century, the time period where The Scarlet Letter takes place, the nineteenth century, when the novel was written, and ri ght now, where it is still around today. We know that evil can be something that is somber, such as a serial killer that just doesn’t have a conscience and will never grasp the concept that death is something so mind bogglingly terrible and should never be done to a person.That is one extreme. Evil can also be used to describe your teacher, even if the only reason why is because you didn’t like that she gave you a pop quiz that you failed. This may seem barely related to evil talked about in The Scarlet Letter, but it is not, however. This is because as the Puritans call the acts of love of Hester and Dimmesdale â€Å"evil†, we still don’t really think that they were necessarily evil for doing so, just like the hypothetical teacher probably does not have much of an evil soul.So, there are many different degrees of evil, and they exist in modern context as well as in the wonderful novel. As you now well educated pupils should realize, the novel written hun dreds of years ago, The Scarlet Letter, about a world that we can’t seem to be able to relate to, is still very useful in today’s modern society because of the relation between the novel’s major themes and their relation to today’s modern society.Sin and what it can do to people is a large concept that is a lot to grasp, and it is discussed thoroughly in the book and is clearly alive today. Additionally, the different degrees of evil in the world is definitely a focus of both the novel and our current lives. So no more calling the book bad and difficult and boring. Respect its greatness. Works Cited Hawthorne, Nathaniel. The Scarlet Letter. New York: Tom Doherty Associates, 1988. Print.

Gump Notes Essay - 7299 Words

ts qualitative impairments in social interaction include gross impairment in ability to develop peer relationships appropriate to developmental level (He says When I was little, mama kep me inside a lot, so as the other kids wouldnt bother me), and it does not seem likely that he was motivated to share enjoyment, interests or achievements with other people at least at ages of primary school. His impairments in communication include a delay in the development of spoken language and marked impairment in the ability to sustain a conversation with others, and some of which are unchanged throughout his life (I aint too good at long conversation). His famous line or I got to pee can be evaluated as a stereotyped and idiosyncratic use of†¦show more content†¦During George Wallaces Stand in the Schoolhouse Door protest, Forrest stands curiously in the background, more interested in his surroundings rather than the actual protest. During the Vietnam War, Forrest never questions the m orality or the agenda of the U.S. government, and receives the Congressional Medal of Honor for his efforts. His entire experience during the Vietnam War can be summed up into one conversation between him and the Drill Sergeant: Gump! Whats your sole purpose in this Army? To do whatever you tell me, Drill Sergeant! (Gump 1995) Still, the most dismaying portion of impassive responses glorified in this film can be contributed to Forrests careless involvement in the anti-Vietnam War rally lead by Abbie Hoffman. He was entirely clueless as to the purpose of the anti-war movements. His view of Abbie Hoffmans role? There was this man, giving a little talk... And every time he said the F word, people, for some reason, well, theyd cheer. Though the focus of the film is directed towards Forrest Gump, the effects of social forces are most often expressed and implied through Jenny Curran. 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