Advantages and Disadvantages of Hydroelectricity, Hydroelectric Power, Alternative, Green Energy
Hydroelectric Power
Hydroelectric power is electricity generated by hydropower.
Hydropower is harnessed through the gravitational force of falling or flowing water. On a worldwide standpoint, it is the most widely used form of renewable energy, supplying 2998 TWh of hydroelectricity in 2006 and even mor today. Hydropower has been used for centuries by humans. The electricity is typically created when the water is passed over large mechanical turbines, the water pressure forces the turbines to turn, the mechanical energy created is then converted into electricity.
Advantages of Hydroelectricity
Hydroelectricity does not &use& water, all of the water is returned to its source of origin. Hydroelectric power can be created 24/7 indefinitely assuming that the body of water it is utilizing never runs dry. It is also another absolutely clean source of energy. The power plants, once in place, do not create any waste byproducts in their conversion. Dams constructed can also shut their gates and conserve the water for use when power is in higher demand.
Disadvantages of Hydroelectricity
Like all power plants, hydroelectric plants are very expensive to build, and must be built to a very high standard. The high cost means that plants must operate for a long time to become profitable. The creation of dams can also create flooding of land, which means natural envrionment and the natural habitat of animals, and even people, may be destroyed.
The building of dams for hydroelectric power can also cause a lot of water access problems. The creation of a dam in one location may mean that those down river no longer have control of water flow. This can create controversy in places where neighboring countries share a water supply.
The views and opinions expressed in this page are strictly those of the page author.The contents of this page have not been reviewed or approved by the University of Minnesota.The page is temporarily unavailable
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/etc/nginx/nginx.conf.网络在生活中的利与弊The advantage and disadvantage of Internet
As can be seen from the cartoon, an individual is using a mouse which is connected with a computer by the iron chain. The purpose of the picture is to show us that due attention should be paid to Internet addiction.
从漫画中我们看到，一个人正在使用鼠标，鼠标用铁链连接计算机。这幅图的目的是告诉我们应该重视网络成瘾。
The vivid cartoon is based on the social reality. We can find the concerning examples everywhere. Some classmates of mine spend much time playing computer games, chatting online and watching movies through Internet. They are addicted to Internet and forget their main responsibility —study.
生动的漫画是基于社会现实。随处我们都可以找到相关的例子。我的一些同学花太多的时间玩电脑游戏，上网聊天，网上看电影。他们沉迷于网络而忘记他们的主要任务是学习。
It is imperative for us to solve this severe issue. For one thing, we should appeal to the mass media to advocate the scientific and healthy lifestyle and avoid web addiction. For another, we should encourage every citizen to communicate face to face instead of being fascinated with Internet. I am convinced that human is able to use Internet properly and scientifically.
我们必须解决这个严重的问题。一方面，我们应该呼吁大众媒体倡导科学、健康的生活方式，避免网络成瘾。另一方面，我们应该鼓励每个公民面对面交流而不是着迷于网上沟通。我相信，人类能够正确的、科学的使用互联网。
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