Energy Essay Essay Example for Free

Energy Essay Essay However out of this whole trouble taken from these processes only 30%-35% of the potential energy stored is actually transformed to electricity. And if we sum up the advantages and disadvantages, we see the following: Advantage: Disadvantage: Produces a lot of energy Expensive to build Does not pollute the environment Expensive to maintain 2. Fossil Fuels: Fossil fuels are a type of power that has also caused a lot of controversy, because of the negative effects they have on the environment (e. g. global warming and green-house effect). Fossil fuel actually comes from the remains of Dead Sea animals that died millions of years ago. And actually what happened to them, is that their bones were crushed with each other and pressured by several of the earth piling on top of them until they finally formed fossil fuel but also the heat of the earths core, played a vital factor. The basic energy transformation that takes place in fossil fuel is that the potential energy stored, breaks down through to give heat energy, and that heat energy is transferred to kinetic energy, which drives a steam turbine that will generate electricity. The two very known fossil fuels are coal and oil. However out of this energy transformation process, only 40-45% of the potential energy stored is actually transferred to electricity. And if sum up the advantages and disadvantages, we see the following: Advantage: Disadvantage: Cheap to produce Not good for environment Is not hazardous to peoples health We are running out of them After discussing the non-renewable sources, I am now going to talk about the renewable sources, and to be exact I am going to talk about the following 3 sources: 1. Hydroelectric power: The main energy transformation that takes place in hydroelectric power is that the kinetic energy of the waves, forces generators, which function like a pendulum, swing to vibrate and once they vibrate, they generate electric energy. Out of this small process, the efficiency is only 35% out of the whole energy conversion. But this also however will depend on the wave velocity, because if it is greater, then more kinetic energy will be supplied, if we sum up the advantages and disadvantages, we see the following: Advantage: Disadvantage: Cheap to maintain Expensive to build Delivers a lot of energy. Changes the ecology of the area 2. Solar Power: We can use the power of sun in 2 ways. The first way is by using the sunlight itself into making electrical energy; this is done by the help of photovoltaic cells. And basically what happens is that the sunlight hits the cells which convert these light signals into electrical signals. The second type is done by using the heat of the sun to heat the water which can be used to heat up houses directly or to drive steam turbines which will generate electricity. Also one thing that must be taken into account, in this whole solar power issue. And that thing is the solar constant. The solar constant is the power collected at the top of the atmosphere by a unit area. But basically this can be summed up by saying that it describes the solar radiation, that falls on an area above the atmosphere at a certain angle. This constant, isnt much of a constant because it actually varies on earth with the time of day and year, as well as with the latitude and weather. The maximum values vary between 0. 8 and 1. 0 KW/m2. As for the efficiency of solar power, well it is disappointing to know that it is only 30% of the suns energy is actually transferred to electricity. And if we sum up the advantages and disadvantages, we see the following: Advantage: Disadvantage: Renewable The photovoltaic cells are very fragile Can supply the whole world on its own Useless if used in a place where there is no sun 3. Wind power: A wind generator works by having the blades rotated by the wind, which causes a dynamo (which is like a generator) to spin and then electric energy is produced. The power delivered by a wind generator, varies on the area with the rotor length being the diameter. This is given by the following formula: P=Ek/t And the efficiency of this wind generator is only 25% which is quiet poor really. And of we sum up the advantages and disadvantages, we see the following: Advantage: Disadvantage: Provides all the energy the world needs Expensive to maintain Renewable Rotor blades are extremely fragile After summarising, both renewable and non-renewable sources, it is time for me to chose the best type of energy resources to use for our homes. The energy resources I suggest are more than 1. First of all the energy resources should be renewable, so that we dont have to worry about the environment and peoples health (unlike fossil fuels and nuclear power). The second thing is that this renewable source, should not affect our environment or ecology (which means hydropower is dropped out! ). Also the energy resource should be efficient, so that we can meet our basic demands for energy, (which means that wind energy also drops out! ). After mentioning these three requirements (which seem essential in my own personal view), it is quiet obvious that the only energy source that I am talking about is Solar!. But however to improve this even more, would be if we insulate our homes well and do not waste our energy for no apparent reason(e. g.like leaving the lights of a room turned on, when no one is in the room. And also buying energy saving equipment). Because like I said at the beginning of this essay, without light we will become extinct. And we all know that we dont want to become extinct, so lets do something about it and try and save our planet. 1 U= Uranium N=Neutron X+Y= Elements Z= Number of Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our  GCSE Electricity and Magnetism  section. Download this essay Print Save Not the one?

Government Censorship :: Internet Censoring Government Essays

Government Censorship Thesis: Government Censorship would damage the atmosphere of the freedom to express ideas on the Internet; therefore, government should not encourage censorship. The Internet is a wonderful place of entertainment and education but like all places used by millions of people, it has some murky corners people would prefer children not to explore. In the physical world society as a whole conspires to protect children, but there are no social or physical constraints to Internet surfing. The Internet Censorship Bill of 1995, also known as the Exon/Coats Communications Decency Act, has been introduced in the U.S. Congress. It would make it a criminal offense to make available to children anything that is indecent, or to send anything indecent with "intent to annoy, abuse, threaten, or harass" ("Stop the Communications ..." n.p.). The goal of this bill as written (though not as stated by its proponents) is to try to make all public discourse on the Internet suitable for young children. The issue of whether is it necessary to have censorship on the Internet is being argued all over the world. There are numerous homepages on the World Wide Web discussing this issue, or asking people to sign the petition to stop government censorship. The Internet was originally a place for people to freely express their ideas worldwide. It is also one of America's most valuable types of technology; scientists use email for quick and easy communication. They post their current scientific discoveries on the Usenet newsgroups so other scientists in the same field of study all over the world can know in minutes. Ordinary people use the Net for communication, expressing their opinions in the newsgroups, obtaining up-to-date information from the WWW, acquiring files by using FTP, etc. Censorship would damage the atmosphere of the freedom to express ideas on the Internet; therefore, government should not encourage censorship. In the Internet community, there is a large volume of technical terms. For this reason, it is first necessary to examine the terminology specific to Internet. The Internet is a world wide computer network. The "Net" is frequently used in place of Internet. In the words of Allison and Baxter, two experts on Internet Censorship at the Monash University, "the Internet is comprised of various digital media subsuming many of the distinct roles of traditional media" (Allison and Baxter 3). Electronic mail (email), which is one component of the Internet, approximates person to person letters, memoranda, notes and even phone calls.

Dynamic Earth Essay

Has the Earth been static since the beginning of time? Well, Earth hasn’t been moving vigorously but it is changing at a steady rate. New geological features, rock formations, and locations of plates all rise and demolish some in a lifetime and others over a span of millions of years. Earth is dynamic; it constantly progresses and doesn’t rest. Through the churns and molds, the twists and turns, Earth is active because of plate tectonics and the rock cycle. The ideas and theories that make up plate tectonics have shown Earth’s dynamism. The position of plates on global maps didn’t always look similar to the maps shown today. 250 million years ago, there existed a super continent, Pangea, which contained all land masses on Earth. Before plate tectonics, people thought the plates were always in the same position; no one could explain how such a large mass could move. It split up some 200 million years ago but scientists recently accepted this idea of moving plates; continental drift. Even more recent was the idea of sea-floor spreading, the explanation for continental drift. These ideas merged to create what is now known as plate tectonics. In fact, it is more than likely that Earth will resemble Pangea in the future. The ideas that were brought up could easily have been within a person’s lifetime. Volcanoes and earthquakes are also common because of plate tectonics. There are about 500,000 earthquakes and hundreds of minor volcanic eruptions each year caused by the frequent interaction between plates. Plate tectonics are a major piece of evidence for the changing planet. The transformations that occur through the rock cycle have also shown Earth’s dynamism. The rock cycle describes the dynamic transitions that the three main types of rock undergo without any definitive order. A metamorphic rock will not always stay a metamorphic rock; it can turn into a sedimentary rock through weathering and erosion then compaction and cementation or an igneous rock through melting and cooling of magma. For example, the Andes Mountains were formed by the transformations of metamorphic and sedimentary rock. It began to take its present form about 80 to 100 million years ago. Even though the process for change is prolonged, it takes place nonetheless. The rocks we see today may be different millions of years into the future. Basically, nothing is ever set in stone or rather, rock. In conclusion, Earth’s dynamism is shown through plate tectonics and the rock cycle. It is constantly changing despite the slow rate. The features that are visible today won’t be there forever. Volcanoes that were once active will cease to erupt and continents that were once separated by water will be glued together. Beautiful rock formations will be torn down by the violent planet that is Earth. Due to the changing Earth, our understanding changes with it. Scientists constantly come up with new information to prove an idea or counter a theory. The winds of change are coming, can you feel it?

College of Business Development Plan - 1113 Words

Development Plan One constant is change. Technologies change, processes change, research creates and promotes change (Aguinis, 2013). A need for constant change and improvement exists in any organization to remain competitive in the global environment. This need to remain current in teaching and supporting the teaching and research at the College of Business requires that employees invest in their personal development. To assist with this, the college of business not only provides funds for professional development supports ongoing development through the development plan. The objectives of this plan, the content, and the development activities of the development plan for the College of Business will now be discussed. Plan†¦show more content†¦A strategically sound organization such as the college of business will continually develop employees grooming individuals to advance within the organization (Aguinis, 2013). The plan seeks to prepare employees, noting potential to be found and developing the noted talent through trainings, advice, coaching, and other developmental methods (Aguinis, 2013). Beyond developing current skills, the plan will seek to foster new competencies that are applicable to future positions within the organization as well. Enrich Employee’s Work Experience The opportunity to expand and challenge oneself enriches the employment experience (Aguinis, 2013). The vision for the College of Business is: â€Å"We are in the business of building successful futures† (UCCS, 2013). This building of futures includes all stakeholders, not just students or faculty. The university does not always have funds to compensate employees with large merit rewards, but the college expends great effort to ensure employees feel valued and invested in. 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