Video is short but gives a thorough explanation of solar photovoltaic systems. How do they work? Sunlight is captured and converted from light to electricity.Â  The electricity that is made from the convertor is DC (direct current) and needs to be changed to AC (alternating current) by an inverter.Â  Batteries are attached to the inverter to provide electricity to the house when there is no sun.Â  The inverter provides the electricity
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Solar Energy Simplified
Solar power can be complicated, but Solar Decathlon director Richard
King gives Discovery News the lowdown on the three ways anyone can tap the sun's energy. Run time 2:12

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Energy from the Sun
With some very simple equipment and knowledge of basic math it is possible to estimate the power output of the sun. This video describes the process and explains the calculations. The video leaves a challenge: use the results to calculate the total energy arriving at the earth each second and using E=mc^2, calculate the mass loss of the sun. Do NOT look directly at the Sun. (10:27)
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How Wind Power is Converted into Useful Electrical Energy
This video provides a brief tutorial - about harnessing wind energy. The high quality animation is supplemented with text - which explains how wind power - is converted to electrical energy, via a generator. Computer animation set to music with labels provided on screen. (No narration) Run time 02:10.
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Iowa Wind Power
A school district in Iowa is using wind power to power help power the district. You learn how these wind turbines help create energy and help save the environment at the same time. Run time 02:29.
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New Wind Turbine Design Good for Rural, Urban Environment
Wind power is one of the fastest growing forms of alternative energy in the world. Because the propellers are so large the windmills need to be in the countryside.Â  But a new form of wind power is now designed to work in an urban environment it is a propeller free wind mill, called a wind spire.Â  It is modeled after an ancient Egyptian wheat grinder.Â  The small wind mill can supply 25 â€“ 30 percent of power in your house they also have a large
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Windpower
National Agriculture Report. The wind - energy to capture. Looking for ways to feed the world's appetite for power, yet preserve our natural resources - the answer may be blowing in the wind. Run time 02:16.
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How Wind Power Is Created
Wind power is created by windmills, which use generators to
produce electricity that is gathered by wires. Find out why some
windmills produce more energy than others with information from a
science teacher in this video.

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Energy from the Wind
This ten-minute video demonstrates how to construct a model windmill and then calculate its power output.
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How To Make a Battery From a Potato
Following on from Edison's first lightblub moment back in 1879, the OU's Stephen Serjeant experiments with an alternative power source - the humble potato. Video experiment explains the process and why you need more than one potato. Grades 5-12. Includes closed captioning. Â 2:31 min.
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Vinegar Battery
Using only vinegar and a few simple materials it is possible to construct a working battery. This video explains how to construct, and use, a battery like this to power a calculator. A good science project as part of an introductory electricity course. This project can be used as a science fair project.
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Political Correctness
This lesson deals withÂ political correctness. There is a definition of PR and there is useful vocabulary presented. There is reference to attitude and how the things we say influence others. There are clear examples about gender, physically challenged, ethnic groups, etc.
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What does Influence Mean? Who has Influenced you?
This lessonÂ deals with the meaning andÂ the power of influence. How does it affect us? There is a clear definition of the word "Influence" and there are many words listed. The new vocabulary is presented in context and you can read the examples on the screen.
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"A Brave and Startling Truth" Poem by Maya Angelou
This is a visually powerful video mashup of Maya Angelou's poem "A Brave and Startling Truth."Â  AsÂ the poet reads her poem, weÂ watch a series of images of horrific historical nightmares and terrorsÂ as well as natural and artistic beauty and social/political/religious people and customs. Â (6:03)
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Windmill
Instructions for constructing this windmill can be found at, http://hilaroad.com/projects . This video explains how to calculate the power output of a windmill.
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Lightning: Nature Strikes Back - 2/7
It is five times hotter than the sun and turns sand to glass in an instant. It can shoot 80 kilometres up above storm clouds. And it may even have provided the original spark that created life itself. This pacy, stylish documentary reveals the full power of lightning, why it is so dangerous, and what scientists are doing to protect us.
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End of Feudalism and Beginning of Commerce
Europe experienced radical economic and social changes between the 11th and 14th centuries. The medieval world was based on feudalism, a highly regulated and hierarchical form of society in which everyone had their place and responsibilities. The manorial system, in which lords owned the land worked by their vassals, or serfs, started to wane in the late Middle Ages with the development of nation-states. Medieval cities, dominated by the guilds that brought economic stability, became the centers
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17.951 Special Graduate Topic in Political Science: Public Opinion (MIT)
This course provides an introduction to the vast literature devoted to public opinion. In the next 12 weeks, we will survey the major theoretical approaches and empirical research in the field of political behavior (though we will only tangentially discuss political  participation and voting). For the most part we will focus on American public opinion, though some of the work we will read is comparative in nature.