Hydro Power Essay Example for Free

Hydro Power Essay Worldwide, hydropower plants produce about 24 percent of the worlds electricity and supply more than 1 billion people with power. The worlds hydropower plants output a combined total of675,000 megawatts, the energy equivalent of 3.6 billion barrels of oil, according to the National Renewable Energy Laboratory. There are more than 2,000 hydropower plants operating in the United States, making hydropower the countrys largest renewable energy source. In this article, well take a look at how falling water creates energy and learn about the hydrologic cycle that creates the water flow essential for hydropower. You will also get a glimpse at one unique application of hydropower that may affect your daily life. 1.INTRODUCTION The basic principle of hydropower is that if water can be piped from a certain level to a lower level, then the resulting water pressure can be used to do work. If the water pressure is allowed to move a mechanical component then that movement involves the conversion of the potential energy of the water into mechanical energy. Hydro turbines convert water pressure into mechanical shaft power, which can be used to drive an electricity generator, a grinding mill or some other useful device. 2.HistoryThe use of falling water as a source of energy is known for a long time. In the ancient times waterwheels were used already, but only at the beginning of the nineteenth century with the invention of the hydro turbine the use of hydropower got a new impulse.Small-scale hydropower was the most common way of electricity generating in the early 20th century. In 1924 for example in Switzerland nearly 7000 small scale hydropower stations were in use. The improvement of distribution possibilities of electricity by means of high voltage transmission lines caused fainted interest in small scale hydropower.Renewed interest in the technology of small scale hydropower started in China. Estimates say that between 1970 and 1985 nearly 76,000 small scale hydro stations have been built there! 3.Advantages and disadvantagesHydropower is a very clean source of energy. It does not consume but only uses the water, after use it is available for other purposes (although on a lower horizontal level). The conversion of the potential energy of water into mechanical energy is a technology with a high efficiency (in most cases double that of conventional thermal power stations).The use of hydropower can make a contribution to savings on exhaustible energy sources. Each 600 kWh of electricity generated with a hydro plant is equivalent to 1 barrel of oil (assuming an efficiency of 38 % for the conversion of oil into electricity). The main advantages of hydropower are: * power is usually continuously available on demand, * given a reasonable head, it is a concentrated energy source, * the energy available is predictable, * no fuel and limited maintenance are required, so running costs are low (compared with diesel power) and in many cases imports are displaced to the benefit of the local economy, * it is a long-lasting and robust technology; systems can last for 50 years or more without major new investments.Against these, the main shortcomings are: * it is a site specific technology and sites that are well suited to the harnessing of water power and are also close to a location where the power can be economically exploited are not very common, * there is always a maximum useful power output available from a given hydropower site, which limits the level of expansion of activities which make use of the power, * river flows often vary considerably with the seasons, especially where there are monsoon-type climate s and this can limit the firm power output to quite a small fraction of the possible peak output, * lack of familiarity with the technology and how to apply it inhibits the exploitation of hydro resources in some areas. 4.From water to WattsTo know the power potential of water in a river it is necessary to know the flow in the river and the available head.The flow of the river is the amount of water (in m3 or litres) which passes in a certain amount of time a cross section of the river. Flows are normally given in cubic meters per second (m3/s) or in litres per second (l/s).Head is the vertical difference in level (in meters) the water falls down.The theoretical power (P) available from a given head of water is in exact proportion to the head H and the flow Q.P=Q Ãâ€" H Ãâ€" c c = constantThe constant c is the product of the density of water and the acceleration due to gravity (g).If P is measured in Watts, Q in m3/s and H in meters, the gross power of the flow of water is:P=1000 Ãâ€" 9.8 Ãâ€" Q Ãâ€" HThis available power will be converted by the hydro turbine in mechanical power. As a turbine has an efficiency lower than 1, the generated power will be a fraction of the available gross power. Applications. Hydro power is also utilised by large scale companies as a private use. Many large mining companies or aluminium manufacturers use vast amounts of electrical so rather than buying from the state they can generate their own power by using hydro power generation.

Capital Punishment in the Work of George Orwell, H.L. Mencken, and Norm

Capital Punishment in the Work of George Orwell, H.L. Mencken, and Norman Mailer   Ã‚  Ã‚  Ã‚  Ã‚  Capital punishment in the essays by George Orwell, H.L. Mencken, and Norman Mailer was a necessary evil to deter crime. These authors incorporated the use of alcohol or drugs as mind-altering chemicals to relieve the pressures of the characters involved in death due to capital punishment. Chemicals such as drugs and alcohol can be used for the pleasure of relieving stress, a means to forget, or a way to subdue personal beliefs as the authors have illustrated.  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚   The pleasure of relieving stress in George Orwell's essay "A Hanging" was detailed by his thoughts written as one of the executioners. This character drank alcohol to relieve the painful memories of escorting the prisoner to the gallows. The character would have rather saved the man from hanging when the author wrote "It is curious, but till that moment I had never realized what it means to destroy a healthy, conscious man" (pg 89). Orwell describes in detail how the condemned man "was not dying, he was alive just as we are alive all the organs of his body were working, bowels digesting food, skin renewing itself, nails growing, tissues forming, all toiling away in solemn foolery." (pg 89). The author continues to illustrate the character's mental anguish when he says "he and we were a party of men walking together, seeing, hearing, feeling, understanding the same world, and in two minutes with a sudden snap, one o...

A Study on Consumer Perception on Nokia

A study on consumer perception on nokia phone in Kanyakumari district Introduction:- Nokia phone is the biggest brand company industry globally. it is most chepaest which gave more Features. Nokia provide the cheapest rates according to other competitors and well known for the lowest price all over the price. People are ready to pay extra but want the good back from the usage of the mobile and want that and expact for the long time time usage from the mobile.The biggest benefit of the nokia mobile phones are that they are good in resold price ,a less loss can be expected as to others mobile phones. the nokia was awarded and continously on the first price for the best mobile from the last 5 years. The first camera on the mobile was invented by the nokia mobiles phones ever in the market and it blust all the market and taken the place ,which put the others in a big trouble for not seling there mobiles phones.The nokia was the changing its features day by the as the first camera and the tourch light music nd radio in it . Most of the time now mobiles phones are using as for the business purposes. The camera was best in the battery timings and still known well for the battery timings its battery works more then the one day and the lower class always appriciate the nokia for the best battery providing in the mobiles phones with the lowest price. Acheivements of nokia:-The achevements of nokia is that they are trying to provide the best mobiles prices and well satisfaction to there user . the nokia always focuses on the goals how to improve to get the attention of there there user who appriciate the nokia and day by day there for they bringign the changes in the mobiles phones due to the greediness of the smart phones the nokia has lost its importance in the market becouse it does not follow the same conidion as the other. Nokia market:-The nokia is now getting the weak in the market but still only the low class people use this mobile phone as they can afford and its too strong in even physically as well . the first mobile was 3310 which made the huge market of the this set and then after like 1112,1110 and so on. The blast in market was also when the nokia introduce the n71 ,n91 n8 and many others like this becouse the memory card and built in memory was introduce by the nokia mobile phones The nokia starting inventions:-The nokia mobiles phones were the biggest phones becouse there there size was too large and the customers feel ord to use this phones as of the size is the big but later when it convert and change it into the small and like the mobiles they 3310 then people appricaite it. Now the mobile charger are also available in the market in as they are called as usb charger it is easy to use even the car while travelling you can use it for the cahrging and now more comfortable is that thses chargers are also availble in the sort of bluetooth.

Equiano s Narrative Of The Captivity And Restoration Of...

What would you do if you were taken by people you did know, and were held captive for ransom for 11 weeks or were sold into the slave trade at the age of 10? These events happened to two people from different countries, and at completely different points in time. Both narratives show journeys of hardship â€Å"A Narrative of the Captivity and Restoration of Mrs. Mary Rowlandson† and â€Å"The Narrative of the Life of Olaudah Equiano or Gustavus Vassa, the African†. Mary Rowlandson’s story is about her journey through an 11 week period in which she was held captive by Native Americans during the King Philip s war, she was taken in exchange for ransom, as they needed money. Olaudah Equiano’s narrative is about an 11 year old African boy who was†¦show more content†¦this part of her story why she was worse off than Equiano. Rowlandson during the start of her captivity, is shown to be treated horribly. Equiano on the other hand, was treated like an equal at the start of his captivity. â€Å"The next day I was washed and perfumed, and when mealtime came I was led into the presence of my mistress, and ate and drank before her and her son. This filled me with astonishment; and I could scare help expressing my surprise that the young gentlemen should suffer me, who was bound, to eat with him who was free†¦Ã¢â‚¬  (Equiano 60). While staying at the house, Equiano was treated respectfully by his mistress and her family. He ate with them at mealtime, also eating and drinking before the son, because of a custom they believed. It gave Equiano hope, he finally began thinking that he was going to be apart of the family. As he was treated like an equal there. It gave him motivation to overcome all of the obstacles in his life. So he could finally have the life he deserves. I believe that due to the facts present, Equiano was treated much better than Rowlandson. He was treated as an equal and it seemed that he was soon going to bec ame part of the family. Rowlandson on the other hand, had to accept the death of her youngest daughter, and wasn t even present at her burial. Paragraph 2: choices The choices of Equiano and Rowlandson were acutely different. Equiano’s choices were to help others, whileShow MoreRelatedA Narrative Of Captivity By Mary Rowlandson Essay962 Words   |  4 PagesA Narrative of Captivity by Mary Rowlandson and The Interesting Narrative of the Life of Olaudah Equiano by Olaudah Equiano are captivity narratives in which the two narrators share their individual stories of being abruptly kidnapped and enslaved. Equiano was an black 11 year old boy who was stolen from his home by African slave traders in 1756. Rowlandson, a 39 year old Puritan woman, was taken in 1675, during King Philip’s War, after Indians raided her town. Although the two authors are both kidnappedRead MoreA Narrative Of The Life Of Olaudah Equiano1246 Words   |  5 PagesCaptivity narratives were popular with readers in both America and the European continent during the era of North and South American discovery and colonization. They related the experiences of whites being enslaved by Native Americans and of Africans being enslaved by whites. Two captivity narratives that were widely read during the time are A Narrative of the Capture and Restoration of Mrs. Mary Rowlandson by Mary Rowlandson and The Interesting Narrative of the Life of Olaudah Equiano by OlaudahRead MoreThe Tribe Not Only Kidnapped Mary Rowlandson1263 Words   |  6 Pagesset flames to Rowlandson’s life. The tribe not only kidnapped Mary Rowlandson, but her three kids as well. This tragedy is what inspired Rowlandson to start writing and becoming a famous known American author. The beginning of Mary White Rowlandson’s life started in the year of 1637. She was born in Somerset England. A little ways down the road of her life, Rowlandson’s parents brought her to the Massachusetts colonies. In fact, Mary Rowlandson’s father was known to be one of the wealthiest menRead MoreBrief Survey of American Literature3339 Words   |  14 PagesNative American oral literature / oral tradition - European explorers’ letters, diaries, reports, etc., such as Christopher Columbus’s letters about his voyage to the â€Å"New world†. - Anglo (New England) settlers’ books, sermons, journals, narratives, and poetry Native American / American Indian oral literature / oral tradition creation storiesï ¼Ë†Ã¨ µ ·Ã¦ º Ã§ ¥Å¾Ã¨ ¯ Ã¯ ¼â€° trickster talesï ¼Ë†Ã¦  ¶Ã¤ ½Å"å‰ §Ã¨â‚¬â€¦Ã¤ ¼  Ã¥ ¥â€¡Ã¯ ¼â€° rituals / ceremoniesï ¼Ë†Ã¥â€¦ ¸Ã¤ » ªÃ¯ ¼â€° songs / chantsï ¼Ë†Ã¦â€º ²Ã¨ ¯ Ã¯ ¼â€° Anglo Settlers’ Writings Highly religious and pragmatic - John