Electrical and Electronic principles Lab Report Example | Topics and Well Written Essays - 500 words

Electrical and Electronic principles - Lab Report Example When connected to the DC power source, the current flows through the circuit. The potential difference increases while the capacitor is being charged. When the voltage on the terminals is of the capacitors is equal to the power supply voltage, the capacitor is fully charged. When the circuit is disconnected from the power supply, the capacitor is said to be discharging through the resistors. The voltage across the circuits then drops gradually until it is zero. At first, there is very little charge in the circuit. When power is supplied from the DC source, a charge builds up in the both the resistors and the capacitors. It is noted that as the charge increases in the circuit, the current recorded on the circuit gets smaller. From the experiment carried out above, we can learn that the changes in both the voltage and current in a multisim circuit when charging and discharging. The charge Q in a circuit is dependent on the amount of voltage present and in turn this influences the current measured on the circuit. When the amount of charge gets larger, the amount of current measured gets smaller. When discharging, the voltage across the resistors and the capacitors drops gradually until it reduces to zero. The phase angles of both current and the voltage in this circuit have equal but opposite magnitude. The tests carried out in the lab and through simulation of the multisim circuit have been used to demonstrate that these conclusions are true. In conclusion, it has the concept of charging and recharging of multisim circuits has been well understood and all the factors that influence the obtained results have been identified hence the objective has been fully

The nuclear power

The nuclear power Introduction I am writing this essay to debate the idea of having nuclear power developed for future use by us. This takes on a major issue and covers many aspects of my nations energy use both in present and for the future. When we think about nuclear power we do not automatically think of it as a non renewable energy source. This is because it is not part of the fossils fuels; coal, oil and gas, which we all know will not last us as reliable energy sources for much longer. However, nuclear power is a non renewable energy source and Nuclear energy is considered an important fuel to produce energy How is nuclear energy made? Nuclear energy is obtained by processes of nuclear fission and fusion. In nuclear fission the energy is released by splitting the atom sending a neutron blasting through the nucleus, this makes other neutrons fly off at high speeds setting up a chain reaction. Nuclear fusion is the opposite by which the nuclei of two or more atoms fuse together, in the process mass is lost and this is then converted into energy. Production of energy takes place inside a nuclear reactor which consists of a core surrounded by a thick concrete shield, steam pipes, turbines and a final (electricity) generator. After the mining of the ore (this is mainly uranium or plutonium ore) has been done the pure uranium is turned into uranium dioxide which is made into pellets. Several of these pellets are placed inside fuel rods. Usually there are about 90,000 fuel rods placed in the core of a reactor. Nuclear fission takes place inside the core by which the isotope splits using the atoms in the uranium dioxide from the pellets. The immense heat produced by this is carried away by fluid circulating through the reactor core. Once the fluid becomes heated it is used to produce steam, this steam drives the turbines which in turn rotate the main electricity generators to produce clean, reliable electricity. During this process there is a massive amount of radiation and so this is why the core is surrounded by a thick concrete shield to absorb this radiation. Arguments FOR using and developing nuclear power To satisfy our general needs of heating our water, heating our homes, cooking our food, powering our appliances and lighting our rooms, we need to retrieve energy from the many many methods available to us. One of these choices is nuclear energy. There are very good reasons why it should be considered and developed further, to be used in the future. Firstly, by comparing it to the other non renewable energy sources (coal, oil and natural gas), nuclear power is a very clean energy as it does not produce any of the greenhouse gases such as carbon dioxide, which lead to the greenhouse effect or global warming. This problem is significant for the disintegration of the ozone layer when fossil fuels are burnt to release energy. Plus using this form of energy can save the reserves we have left of some of the precious fossils fuels like oil, which is said to run out within the next 50 years. Because nuclear power already supplies lots of energy, it is also much more reliable at present than many of the renewable options we have available such as wind, solar and wave. A very important point and something that must be considered is that there can be huge amount of energy produced from just a small amount of nuclear element. Just one kilogram of uranium can produce as much energy as 3,000,000 kilograms of coal. Finally, with the nuclear energy economy being one of the safest in the world, producing the cheapest energy, development in the future can provide thousands of jobs and other opportunities of stable employment for many people. Arguments AGAINST using and developing nuclear power As well as the very well argued points agreeing with the future use of nuclear energy, there is opposition to this expansion. There are many people and often groups that raise concerns about the safety of nuclear power. Nuclear waste that is produced from the nuclear power stations emits a very high amount of dangerous radiation that can stay radioactive for up to 25,000 years so it must be disposed of very carefully. Any accident is extremely dangerous and can kill any life in the surrounding area immediately. A case study that shows the extreme risk of development of nuclear power and what can happen if an accident occurs is the 1986 incident in Chernobyl, Russia. Here a nuclear reactor exploded killing 31 people, and around 140,000 people were evacuated as quickly as possible. This area around the explosion was contaminated by radiation and this will remain for a long period of time. The clouds of radioactive material that were also released by the explosion spread, reaching even as far as Sweden. The wind that blew from Chernobyl also came across to Britain and caused acid and other toxic rain that ruined farmland, making the soil radioactive. Farmers are still having problems in parts of Wales because of the radiation that has spread as a result of an accident at a nuclear power plant. Rather than looking at nuclear energys dangers, it also has a few faults. One of these are that a big part of the energy that is created must be blown away because it cannot be used. Nuclear power is also unable to adjust to a lower power production for night. These are faults which not only can cause problems but also inconvenience. Back to the issue of the nuclear waste, focusing away from its safety concerns, and more about where it can be disposed of without causing major problems. As it does stay radioactive for a very long time it must be discarded carefully. The pollution of this waste can cause serious effects on both people and the environment. An example of pollution has been in the Irish sea which was dreadfully polluted by the nuclear waste from the power plant at Sellafield in Cumbria. This fuel should ideally be stored in a safe environment either underground or in special concrete surrounded stainless steel liquid tanks. Another concern that is brought up with nuclear power is the potential for nuclear weapons to be developed. In these weapons would be uncontrolled nuclear fission where even if just a small amount of unstable uranium or plutonium is used, a bomb would explode. If more countries turned to the development of nuclear energy we could be at risk of production of these weapons by countries such those in the Middle East and terrorist groups, some believe it may even lead to a possible nuclear war in the future. Conclusion Looking at all of the arguments for and against the issue of whether nuclear power should be developed for future energy supplies, they are all valid reason that should be taken into account. As for my personal response, I feel that nuclear energy should not be developed as the building of more power plants could cause harmful effects, especially if accidents occur. I feel that the chance of accidents taking place are far more likely if this source of energy is developed. This can lead to the deaths of many lives due to the sheer amount of radiation. Plus looking at the locations of nuclear power plants in the UK, they are mainly in remote areas, for obvious reasons, and also near the sea. More of these can lead to their expansion in more populated areas putting many lives in danger. I also feel that instead of turning to another non renewable energy from fossil fuels, it is far better to invest and research into the development of renewable sources which will give us clean, cheap energy in the future. By looking at changing the technology for these alternatives now, we can help plan for the future. However, if the nuclear industry was developed then when reserves of uranium and plutonium ran out we would once again be searching for other ways. So overall I feel that nuclear energy, although cheap and reliable, is not the best option to be developed for future use, not just in this country but around the world.

Whitmans Democracy :: essays research papers

Whitman's Democracy "I speak the pass-word primeval, I give the sign of democracy, By God! I will Accept nothing which all cannot have their counterpart of on the same terms." This is Whitman's expression of the idea of democracy taken from "Song of Myself." In this all encompassing interpretation Whitman says that the freedom offered by democracy is for all not a chosen few. It included all people, not renouncing those of other races, creeds, or social standings. Examples of this acceptance are scattered through many of the poems Whitman wrote. In his poem "To a Common Prostitute" Whitman wrote: "Not till The sun excludes you do I exclude you." He has accepted the women as a prostitute, but this also conveys Whitman's ideas of democracy. The notion that all people should be covered under the cover of freedom. The sun is used as a metaphor for democracy in this poem, as it should shine upon all equally. When Whitman discusses the "shunn'd persons" in "Native Moments" he once again mimics the concepts of democracy with his words. He lets all know that he embraces the people that others have rejected, as democracy should embrace all. These people are part of America also, and should be accepted as such. as democracy should embrace all. Whitman commends the many people of America in "I Hear America Singing." He writes of the mothers, and the carpenters. He says that they all sing their own song of what belongs to them. In this poem Whitman brings these people from all backgrounds together as Americans. In the freedom of American democracy

Fluke, or, I Know Why the Winged Whale Sings Chapter 10~11

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Not Either an Experimental Doll

Ryan Shellady Professor Mtisi Paideia October 31st, 2012 Placing Fault: A Look at Determining Who is to Blame for Lily Moya’s Downfall in Not Either an Experimental Doll The Separate Worlds of Three South African Women In today’s Western culture, it is hard to imagine a world without education. Adults and children alike view education as a common practice that is essential to everyday life. For Lily Moya, this is not the case. In Not Either an Experimental Doll, edited by Shula Marks, letters of correspondence reveal a relationship between Dr.Mabel Palmer, a well-known European supporter of black education, and Lily Moya, a girl growing up in apartheid South Africa. Lily writes to Palmer requesting acceptance into a school. Due to Lily’s amusing writing style, Palmer feels a connection to her. In turn, Palmer decides to find a way to fund Lily’s education. Throughout the letters, Lily alludes to this idea that she desires a more intimate friendship with Pa lmer; however, Palmer continues to assertively state that the relationship Lily seeks is impossible.In the end of the correspondence, Dr. Palmer releases her sponsorship from Lily’s education which means Lily can no longer attend school. For these two reasons, some critics will argue that Palmer is to blame for Lily’s mental breakdown at the end of the book. These people are mistaken; Mabel Palmer’s actions are not to blame for what happens to Lily. Fault lies in the differing cultures between Lily and Palmer, and in Lily’s stubbornness, egocentrism, and her inability to follow simple instructions.It is easy to infer that there are inevitable differences in culture between a European woman in her seventies and a fifteen-year-old African girl living in apartheid-ruled South Africa. In the introduction of the book, editor and expert in the field of South African studies Shula Marks articulates that the cultural differences between Lily and Dr. Palmer make f or a difficult understanding of correspondence etiquette. Not surprisingly, the world of the busy academic was remote from the concerns of a lonely and aspirant fifteen-year-old in Umtata.For Lily, still living in a world in which misfortune was explained in terms of individual wickedness and witchcraft, Mabel’s failure to reply could only be the result of the evil counsel of her advisers (Marks 18). Lily has been raised in a place where academia is not prominent. To understand why Dr. Palmer didn’t reply swiftly and quickly to each of Lily’s letters, Lily would have to understand all the work Dr. Palmer’s occupation entails. Lily would have to realize that people are sometimes simply too busy to write; however, as Marks notes, Dr.Palmer’s failure to reply was likely explained to Lily in terms of â€Å"individual wickedness. † Later in the same paragraph of the introduction, Marks goes on to describe Palmer’s point of view. For Mabel, Lily’s intense if adolescent religious experience was to appear as ‘religiosity’ and ‘self-righteous’, while she had difficulty remembering whether her ‘protegee’ was an Anglican or a Catholic, and had no idea that she was Xhosa, not Zulu (Marks 18). Palmer is under the impression that she understands Lily’s background, but Marks exposes Palmer’s ignorance of Lily’s culture.This lack of knowledge leads to poor communication between Lily and Palmer. However, Palmer does attempt to lessen her ignorance by asking Lily to write a paper, â€Å"The Life of a Native Girl in a Native Reserve† (Marks 87). In this paper, Palmer asks Lily to detail activities, problems, and daily routines experienced by a girl living in Lily’s society. Due to this attempt, Palmer’s failure to comprehend Lily’s expectations can be forgiven. Palmer tries to understand Lily and her background, but Lily cannot communica te any information in return.In the greater scheme, neither Lily nor Palmer is to blame for cultural variances. The only thing at fault in this particular case is that the two grew up in completely different environments. Circumstance is not solely to blame, however. In other cases, Lily’s personal faults are also to blame. The first of Lily’s individual weaknesses that lead to her demise is stubbornness; it plays a large role in why Palmer has such a difficult time dealing with Lily. On a number of occasions through the correspondence, Lily attempts to treat Palmer as though the two of them are close, intimate friends.Lily even goes as far as saying to Palmer, â€Å"I hope you stay for years, with me† (Marks 113). If this is not pressure enough, Lily goes on to guilt Palmer by proclaiming, â€Å"You cannot leave me alone in this merciless world† (Marks 113). When faced with these remarks, she needed to address Lily’s outlook on their relationship to make sure Lily understood that their interaction had to remain professional. You say that one of your reasons for wishing to be in Durban is that you want to see more of me, but have you ever asked yourself whether I wish do see more of you?As a matter of fact I do not. Your romantic and self-centered imagination has built up for you a picture in which you are to be my devoted and intimate friend. Now you must forgive me for saying that this is all nonsense. Even if you were a European girl of your age it would still be nonsense (Marks 136). Palmer makes it very clear that Lily’s feelings for her are simply not reciprocated. Palmer says she does not wish to see Lily, and that Lily’s perception of their connection is just â€Å"nonsense†. Critics will argue that Palmer’s tone here is too aggressive though.They’ll argue that Palmer should have anticipated that her words would hurt Lily deeply. They’ll back up their assertions with quotation s like the following where Lily jumps to drastic conclusions about Palmer not responding swiftly enough. â€Å"Your silence impresses me severely, in so much that patience fails me† (Marks 87). â€Å"I’m really worried now. It is a long time I have been waiting for yours [letter]† (Marks 91). One might claim that Lily displays great sensitivity and anxiety because of Palmer.These critics therefore argue that if waiting for a response from Palmer causes Lily this much distress, then it should be obvious to Palmer that critical words would cause Lily worse sorrow and anguish. These critics are wrong for two reasons. First, Lily still goes on to address Palmer on January 28th, February 6th, and again on February 16th of 1951 (Marks 143-145). All of these dates are after Palmer’s direct note from page 136 mentioned previously. Lily did not receive a letter from Palmer between these three instances.It is fair to say that Palmer’s annoyance is justified when she very recently asked Lily to respect boundaries. Secondly, the quotes these critics may use do not show that Lily is sensitive; rather they show that Lily is impatient and bullheaded. Lily keeps writing to Palmer so Palmer does not neglect her promise to help Lily get into school. Lily actually reminds Palmer of this promise. â€Å"So, please do not forget your promise that you would send me to school to complete the Matriculation Course† (Marks 94).Because Palmer does not write back quickly, Lily is worried that she isn’t getting her way, and stubbornly writes another letter out of impatience. Lily’s stubbornness to both get her way and to create a friendship that is deeper than a professional level shows a character flaw that certainly leads to her downfall. Lily cannot accept anything less than her own expectations; when she is faced with a disappointment, she spirals into a depression. Stubbornness is not the only character flaw leading to Lilyâ€⠄¢s downfall though. When Palmer addresses Lily about their relationship, she notes that Lily is â€Å"self-centered†.Lily’s egocentrism is yet another trait that ultimately leads to her breakdown. Palmer is correct when she states that Lily writes amusingly when it is about herself. â€Å"Looking back over my correspondence with you I realize that you only write interestingly and amusingly when you are writing about yourself† (Marks 138). For example, in Lily’s letter written on the 26th of January, 1949, the tone she uses in her writing has a pleading, begging feel because it is one Lily is writing to further her own attempt at finding an education.Kindly sympathise with me, a helpless orphan, I beg you †¦ I can be very glad if you answer me at your earliest possible and please I beg you do sympathise with. You can only show your sympathy by taking me to a college where I shall work with my level best my school work, and, I’m sure I’l l please you in any way in my character (Marks 59). For being a student with so little education, Lily really shows finesse in her writing ability. Her use of description in the â€Å"helpless orphan† bit tugs at Palmer’s heartstrings. Lily is even smart enough to know that tone and word choice an sway a person’s ethos, but like Palmer says, Lily only uses this for personal gain. Palmer, however, is not the only person that notices Lily’s egocentrism. Palmer notes that one of Lily’s caretakers also feels that Lily focuses on self too much. â€Å"†¦I understand Mrs Bomback thinks that she [Lily] is already inclined to think too much of herself†¦Ã¢â‚¬  (Marks 128). Lily’s self-centered personality is clearly not seen by Palmer alone. This egocentrism leads Lily to see only her own needs in Palmer. When Palmer revokes her funding, Lily sees it as a great personal loss.This is yet another fault leading Lily to her mental breakdown at the end of the correspondence; moreover, it also leads to her difficulty following rules. An inability to follow instructions has already been demonstrated in Lily’s inability to accept a non-personal friendship with Palmer. This is, in fact, one of many instances in which Lily defies rules. In one instance, upon being told not to do so, Lily â€Å"entered a men Lecturer’s hostel with the purpose of receiving a lesson from one of them† (Marks 133). This is a clear violation of rules laid out by caretaker Mrs.Bomback. In another instance Lily was expected to come to an appointment with Palmer, yet she failed to show up (Marks 183). Arriving at an appointment punctually is an easy task to accomplish, yet Lily failed to do as she was told. This reason alone is one that Palmer lists as a reason for revoking funding for Lily’s education. Palmer confronts Lily twice for not following directions (Marks 136; 161). It is very clear to see that obstinate behavior causes Palmer to withdraw her funding leading to Lily’s mental break down.Some argue that Palmer’s withdrawal is ultimately to blame for Lily’s downward spiral. It is easy to see how misguided these people are if one considers that Palmer never wished to stop funding Lily’s education. She went out of her way to ask Sibusisiwe Makhanya for help to try and repair the problems Lily had been facing (Marks 121-122). It was only when Lily continued to break rules and disrespect Palmer’s wishes that Palmer had to quit. Lily made herself a lost cause. Is it fair to blame Palmer for Lily’s affairs after Palmer spent money out of her own pocket to assist Lily in all of her needs?No, it is absolutely absurd to claim Palmer is at fault. In Not Either an Experimental Doll, it is clear to see that Dr. Mabel Palmer is not to blame for Lily’s depressed state. Circumstance is responsible for the cultural differences between the two main characters thr oughout the correspondence. It is easy to identify Lily’s sense of stubbornness through her insistent attempts at making an intimate friendship with Palmer. Lily’s egocentrism shows in how her writing style changes depending upon whether she is writing about herself or others.It also is fair to call Lily egocentric due to the fact that more than one person identified her self-centered personality. An inability to follow instructions is apparent in different examples and Palmer notes that this is a reason why she terminated her sponsorship for Lily. Critics can continue to argue that Palmer is to blame for Lily’s psychiatric state, but ultimately the circumstances in which the two grew up, and Lily herself, are truly at fault. Works Cited Shula, Marks, ed. Not Either and Experimental Doll. Bloomington and Indianapolis: Indiana UP, 1987. Print.