Wind Turbines Essay -- Energy, Kinetic Energy

Introduction: Wind turbines capture the energy of wind and transform it into kinetic energy that is then converted to electricity. Turbines are available in a range of sizes and designs and can either be free-standing, mounted on a building or integrated into a building structure (Pennycook, 2008). System types: There are basically two sorts of wind turbines: horizontal-axis design and vertical-axis design. Horizontal-axis wind turbines are the most common type used and can have various sizes. This type of turbine has a horizontal rotor shaft and generator usually located at the top of a tower. The propeller-type blades are used to capture wind thus are oriented into the wind, for instance for small turbines a wind vane is used, or if it is a larger turbines a wind sensors will be used in conjunction with servomotors. A turbine system include the following: a rotor, or blades, which convert the wind’s energy into rotational shaft energy; a nacelle containing a drive train, usually including a gearbox ( some wind turbines can even work without the gearbox), a tower which is meant to support the rotor and the drive train. There is electronic equipment such as controls, electrical cables, ground support equipment, and inter-connection equipment (Pennycook, 2008). Fig 1: The following image shows the some components of a horizontal wind turbine. Source: (Alexander, 2008) Usually, vertical-axis turbines are known to have a rotor shaft oriented vertically. This eludes the necessity for a tower and the generator is located at ground level. It also has the advantage to have no need for a yaw mechanism in order to turn the rotor into wind. The principle disadvantages of vertical-axis turbines are that the efficiencies are lowe... ...enerates 1 to 5KW (kilowatts) of energy. However if the development is outside a covered or off-grid area where it will depend only to wind turbine for power, that will increase the needs intensely (Cooper, 2010). In sizing wind turbine for a dwelling, first of all you determine how much energy you need to supply for your home. There is another option which is to use an energy calculator; there is one that is on the website: www.thesolarguide.com . This demonstrates how you obtain the total kilowatt hours you need. According to the American Wind Energy Association, homes use approximately 9,400 kilowatt-hours (KWh) of electricity per year (about 780Kwh per month). To make a substantial contribution in order to meet the demand depending on the average wind speed in the area, a wind turbine rated in the range of 5 to 15 kilowatts would be needed (Cooper, 2010).

Life today is better

Modern life is very different from life 50 years ago. Some people think the changes were positive changes while some people thinks the changes were negative changes. It Is true; life 50 years ago is simpler than life now. 50 years ago, the pace of life is slower and family could spend their time together longer. They could attend family occasions like wedding and Did. Besides, 50 years ago, the living cost Is lower than now.They Just spend a few ringlets per day to buy groceries and consumer Items or they can Just grow vegetables or raise animals Like chicken, cow or goat as their food sources. Notwithstanding, I think life today Is much better than It was 50 years ago. Life today has a higher technology. First of all, technology brings about a great many convenience and amenity. When we need to contact people, we use cellophanes to call them, we can fax them, we can send an e-mail to them or we can make a video call with them.Nowadays, we have Internet that direct us to Backbone, Tw itter, Keep and other application that can be used to connect with people. Besides, we can search for worldwide information in the internet. When we want to abroad a flight, all we need o do is just call the flight ticket agency and buy the tickets online. Using smoothness, everything is much easier as everything is Just on your fingertips. Hence, we can say that with the advancement of technology, life today is better than years ago. Other than connecting with people, internet has thousands of uses.We even can make money using the internet as an example Madam. Com that helps people to sell and buy items in the internet in Malaysia. Next, we have e-Bay which is a site that can be used to pay bills and stuffs. Then, communication is also one of the factors to prove that life today is better than it was. As what we can remember, 50 years ago people didn't have the modern vehicle to move from one place to another place. If before, people usually walk, or uses bull carts or sampan to mo ve but now, we have variety of cars, airplane, train, buses and lorry to get us to our destination.More advances, we also have ALERT, Commuter and MR. as our public transport to send us to our destination faster and more convenience. This proved that life today is better than it was years ago. Next, human rights today is been uphold more than 50 years ago. Now, women can do what they want to do. They can have the career that alt with their passion and interest. They can go out and socialize with their friends. If we look 50 years ago, women is Just a wife that act as person who do the house chores and the one who got to take care of their children and husband and.They even can't go out easily without the permission of their husband. Women 50 years ago usually were forbidden to continue their studies or work In the Job of their Interest. However, nowadays we can see women as the top people In the world In many fields. Equally Important Is the children's right. Children's rights are t o get loves from their parents. They also have the rights to go to school and study. However, children's 50 years ago works as a slave. Their rights' on their education was not been concerned.As have been said, the human rights' today is much better than 50 years ago. As conclusion, life today is better than it was 50 years ago. Nowadays, people live with high technology that eases their daily works. Nowadays, we have modern that help us to connect with people. Today, human rights' had been upheld. There are no more women or children that had been treated the way that suppress or oppress them. In other word, life today is totally mush better than it was 50 years ago.

Black Social, Intellectual, And Political Boundaries

Pan-Africanism signifies the difficulties of black social, intellectual, and political notions over a two hundred year span. What establishes Pan-Africanism, on the basic level, is the unity of Africans worldwide. Pan-Africanists believe that the African people in its entirety, which includes the Diaspora and the African continent, does not just share common beginnings but also a common destiny. (Asante, 1976, p. 97) This ideology of an intertwined past and future of all the African people has however took many forms, as different thinkers feel that there are different methods in achieving African unity. Three great thinkers, W.E.B. Dubois, Marcus Garvey, and Malcolm X, were all leaders of their own Pan-African movement which each contained their own element in achieving Pan-Africanism. DuBois took a more academic stance which included the utilization of the elites, whereas Garvey and Malcolm X were more so grassroots organizers as they believed in the bottom-up decision making rathe r than top-down. To commence, Dr. William Edward Burghardt DuBois, better known as W.E.B. Dubois, is acknowledged as the â€Å"Father of Pan-Africanism.† (Esedebe, 1971, p. 84) One of DuBois first movement towards Pan-Africanism was his idea of the â€Å"Talented Tenth.† He felt that in order to save the Negro race it must be done by â€Å"exceptional men.† (Franklin, 2011, p. 301) Dubois believed that the development of the Negro race must be done through college education. This involved writing books,Show MoreRelatedClaude Mckay s Harlem Dancer And Ended Around 1929 Essay1535 Words   |  7 Pagesby, and about, Blacks. The Harlem Renaissance was a period of great intellectual expression as well as introspection (Bodenner). 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