![]() #WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.This Time in History In these videos, find out what happened this month (or any month!) in history.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.įrom tech to household and wellness products.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today. ![]() 100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.Britannica Beyond We’ve created a new place where questions are at the center of learning.Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Learn about the major environmental problems facing our planet and what can be done about them! SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!įrom fossil fuels and solar power to Thomas Edison and Nicola Tesla’s electric marvels, the world runs on energy.Harness your natural resources and test your knowledge of energy in this quiz. Tidal stream power systems take advantage of ocean currents to drive turbines, particularly in areas around islands or coasts where these currents are fast. ( See also wave power.) Electricity generation potential They can be installed as tidal fences-where turbines are stretched across a channel-or as tidal turbines, which resemble underwater wind turbines ( see wind power). Many tidal power technologies are not available at an industrial scale, and thus tidal energy contributes a negligible fraction of global energy today. There is, however, a large potential for its use, because much usable energy is contained in water currents. The total energy contained in tides worldwide is 3,000 gigawatts (GW billion watts), though estimates of how much of that energy is available for power generation by tidal barrages are between 120 and 400 GW, depending on the location and the potential for conversion. By comparison, a typical new coal-based generating plant produces about 550 megawatts (MW million watts).
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