Renewable Energy Resources: Part 1 | GCSE Physics | Doodle Science

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Script:
Renewable energy resources are being developed because we are running out of fossil fuels at an exponential rate.

The wind is produced as a result of giant convection currents in the Earth’s atmosphere, which are driven by heat energy from the sun. Wind turbines use the wind to drive turbines directly. The blades are connected to a housing, which contains gears linked to a generator. As the wind blows, it transfers some of its kinetic energy to the blades, which turn and drive the generator. The advantages are that there are no fuel costs and no harmful pollutant gases are produced. However, they depend on wind, if there is no wind, there’s no electricity.

Like the wind, water can be used to drive turbines directly. Wave machines use the kinetic energy in this movement to drive electricity generators. Another way of using the water is to build a tidal barrage over a river estuary to make use of the kinetic energy in the moving water. The barrage contains electricity generators, which are driven by the water rushing through tubes in the barrage. Hydroelectric power stations are dams built across a river valley. The water high up behind the dam contains gravitational potential energy. This is transferred to kinetic energy as the water rushes down through tubes inside the dam. The moving water drives electrical generators, which may be built inside the dam. Water produced energy is good because no harmful polluting gases are produced and tidal barrages and hydroelectric power stations are very reliable and can be easily switched on. However, tidal barrages destroy the habitat of estuary species and hydroelectricity dams flood farmland and push people from their homes.
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Green energy is getting better and cheaper, yet we still largely rely on fossil fuels. Why haven’t we switched to solar and wind energy yet?

Which Countries Will Be Underwater Due To Climate Change? – https://youtu.be/1ilC2ODaWSY
Which Countries Run On 100% Renewable Energy? – https://youtu.be/SrmsQzRQPPw
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Read More:
What Would Happen If We Burned All The Fossil Fuels On Earth?
http://www.popsci.com/burning-all-fossil-fuels-could-raise-sea-levels-by-200-feet
“A new study published today in Science Advances finds that if we burn all of the remaining fossil fuels on Earth, almost all of the ice in Antarctica will melt, potentially causing sea levels to rise by as much as 200 feet–enough to drown most major cities in the world.”

Who’s Winning The Battle To Replace Coal?
http://www.forbes.com/sites/thebakersinstitute/2016/05/17/whos-winning-the-battle-to-replace-coal/#e9dc97c6b09f
“Coal is losing the battle for the electricity future in the United States. Investment in new coal-fired generating capacity has dried up with its share of electricity generation dropping from 53% in 2000 to 34% in 2015.”

Electricity in the United States
http://www.eia.gov/energyexplained/index.cfm?page=electricity_in_the_United_States
“In 2015, coal was used for about 33% of the 4 trillion kilowatthours of electricity generated in the United States. In addition to being burned to heat water for steam, natural gas can also be burned to produce hot combustion gases that pass directly through a natural gas turbine, spinning the turbine’s blades to generate electricity.”

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