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[일반] 교내영어 말하기 대회 원고(5학년 최우수 ) 심 예 지
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2010-06-04



 


  Hello, everyone!


Today, I''m going to tell you about the solar power.


Nowadays, the earth is getting hotter and hotter.


So there are many alterations on the planet earth.


Some of the scientists who have been studying for the alterations of


global weather patterns said that the earth is on the verge of ruin.


To prevent its fall, the scientists are looking forward to develop


alternative energy sources.


Alternative energy includes hydrogen energy, wind energy and many


other energies.


Among them which i''m going to explain is the solar energy that is


produced by the ray of sun.


  Have you ever used a magnifying glass to melt something? lf so, you


were using solar power. The sun is a great potential source of energy.


If we could figure out how to gather and use it effectively, just one


hour of sunlight could provide the world with energy for a year.


  There are two ways to use solar power. First, it can be used as a


source of heat. Since ancient Greece and China, people have been


designing their homes to receive as much sun as possible during the


cold winter months.


  The sun can also be used as a source of electricity.


some people use solar collectors such as large panels placed on roofs.


These panels gather the sun''s energy and turn it into electricity.


This technology is Known as photovoltaics. Solar-powered watches and


calculators also use photovoltaics.


  What happens to solar-powered homes when night falls and the sun no


longer shines on solar collectors? Do people in solar-powerd homes


just sit in the darkness? Of course net. Solar panels are attached to


batteries that store the energy gathered from the sun. While the sun


is shining, electricity flows into the batteries, where it is kept for


later use.


  There are more than 10,000 homes in America that use solar power for


all of their electrical needs. As solar power technology continues to


improve, this number should rise quickly.      


But if the sun is dissappeared, we have to find another alternative energy.


One of the alternative is hydrogen.


Hydrogen is the lightest element in the world.


And it is the endless resources.


So hydrogen is used as fuel for cars.


But, if there''s no water on the planet, how can we live?


There''s no need to worry about it.


Because we have wind energy. Wind energy is air kinetic energy.


And this energy can be used instead of electricity. Wind energy has


also boundless resources. Like this there are many alternative energies.


But we have to preserve the environment.


Even though, we have enough alterative energy to use, there is a possiblity that the earth will be collapse.


So l hope the people all around the world save the nature, save the environment and save the earth.


The earth is not only for us but also for the next generations to come. We have to keep it clean, fresh and protective.



















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