Doodle Science teaches you high school physics in a less boring way in almost no time!
Script:
Fossil fuels are non-renewable energy resources; these are coal, oil and natural gas. They were formed from the remains of living organisms millions of years ago and they release heat energy when they are burned. This heat is used to turn water into steam, which is used to turn a turbine, which then drives a generator to generate electricity. There are downsides however, fossil fuels release sulphur dioxide and carbon dioxide which lead to acid rain and an increase in global warming.
Another form of non-renewable energy is Nuclear. The main nuclear fuels are uranium and plutonium. The nuclei of these large atoms are split in a process called nuclear fission to release a great deal of heat. The heat energy is again used to boil water. The kinetic energy in the expanding steam spins turbines, which then drive generators to produce electricity. Unlike fossil fuels, nuclear fuels do not produce carbon or sulphur dioxide. However, they do have the risk of a fault where large amounts of radioactive material could be released into the environment such as the disaster of Chernobyl in 1986. Video Rating: / 5
Around and within each of us is an electro magnetic bio-field. This field can hold physical and emotional pain and or trauma. Bio-Energy Practitioners use gentle non invasive techniques to move blocks from the bio-field and boost natural health and well being.
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Recently, a new study has found that converting annual crops to perennial bioenergy crops can induce a cooling effect on the areas where they are cultivated. The study also demonstrated the importance of the crop type choice, the original land use type upon which bioenergy crops are expanded, the total cultivation area and its spatial distribution patterns.
This video covers the given topic, ‘Bioenergy crops’, in the following structure:
1. Why in the news?
2. About the study.
3. What are Bioenergy Crops ?
4. Other key points .
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Solar panels and wind turbines are great, so long as the sun shines and the wind blows. But what if they do not? Well, then we store the energy. But how? In this video I explain how high the risk of a cold, dark, and windless period is — the “cold Dunkelflaute”, and what energy storage we need for intermittent renewables.
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The figure I show at 1 minute 49 seconds is from this report: https://www.irena.org/publications/2021/Jun/Renewable-Power-Costs-in-2020
The estimate from the German Weather Service that I mention at 2 minutes 46 seconds is here: https://www.dwd.de/DE/presse/pressemitteilungen/DE/2018/20180306_pressemitteilung_klima_pk_news.html
The figure I show at 2 minutes 53 seconds is from this paper: https://www.mdpi.com/1996-1073/14/20/6508
The paper about the reliability of solar and wind which I discuss at about 3 minutes is this: https://www.nature.com/articles/s41467-021-26355-z
The paper I mention at 4 mins 40 seconds is this: https://www.mdpi.com/1996-1073/14/20/6508
The data for installed storage capacity I show at 6 mins 10 seconds is from here: https://sandia.gov/ess-ssl/gesdb/public/statistics.html
https://www.sciencedirect.com/book/9780128198926/thermal-mechanical-and-hybrid-chemical-energy-storage-systems
The paper with the estimates for carbon dioxide emissions from storage is here:
https://pubs.acs.org/doi/10.1021/es505027p
The estimate for the carbon footprint of lithium-ion batteries is from here:
https://www.forbes.com/sites/rrapier/2020/02/16/estimating-the-carbon-footprint-of-utility-scale-battery-storage/?sh=3fde25017adb
And the Swedish report that I mention at 16 mins is here: https://www.ivl.se/download/18.14d7b12e16e3c5c36271070/1574923989017/C444.pdf
Many thanks to Jordi Busqué for helping with this video http://jordibusque.com/
00:00 Intro
00:31 The Dunkelflaute Problem
07:07 Energy Storage Options
14:04 Carbon Footprint of Energy Storage
16:59 What Do We Learn From This?
17:32 Sponsor Message
#science #environment #climatechange Video Rating: / 5
Fossil fuels provide 95% of the world’s total energy, yet are considered to be the largest contributing factor to global warming.
Will you help us to develop sustainable solutions to secure future energy supplies?
http://www.nottingham.ac.uk/impactcampaign Video Rating: / 5
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Hydropower or hydroelectricity is the creation of energy from fast-flowing water to generate electricity. Come behind the scenes of a hydropower station to learn how hydropower works.
Visit our website: www.hydro.com.au
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Transcript:
Hydro Tasmania is Australia’s largest clean energy provider and the largest provider of renewable energy in Australia.
Do you know how we generate electricity from water? This is sometimes referred to as hydroelectricity or hydropower.
It’s all about utilising the two forms of energy that water contains, potential and kinetic, and transferring it into electrical energy.
Potential energy, also known as stored energy, is gained by the construction of dams in varying design along natural waterways.
The water is captured both directly from rain as well as inflows from adjacent rivers, creeks, streams and melting snow.
We can also increase the size of existing lakes by diverting inflows and blocking outflows. An example of this being the Great Lake in our Central Highlands.
As the water rises behind the dam wall the dam’s water becomes a potential energy reservoir. When the demand for electrical energy occurs the stored water is released from the catchment by opening an intake gate or inlet valve.
As all hydropower stations are built lower than the water catchment itself. The water is connected via a combination of canals, tunnels and pipes into the power station below.
The power stations are sometimes built underground. Depending on the type of turbine, the water either flows through or directly hits the turbine runner and causes it to spin. The height between the reservoir and the hydropower station determines how fast and with how much power the energy of water will travel and be transferred to electrical energy.
The energy of the moving water has now transferred to mechanical energy and after it passes through the turbine is released back into the river below the power station.
In addition to generating electricity and through controlled methods, a measured amount of stored water can be released into the downstream river to maintain waterways for both recreation and aquatic life.
Above the spinning turbine is a shaft which connects to the generator. Inside the generator is a rotor and a stator. The rotor contains many magnets. The rotor spins inside the stator which is filled with copper windings.
Now the mechanical energy is transformed into electrical energy which is carried by the copper wire and fed into a transformer.
The voltage is increased to allow for the efficient transmission of energy to a substation near your town, where it is then stepped back down to a lower voltage. The energy is distributed throughout the town or city where it is further stepped down to 415 or 240 volts.
The energy generated from water helps power Tasmanian households and businesses. It’s also sold into the national grid supporting Australia’s transition to a renewable energy future.
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Renewable Energy Certificates, also known as RECs, are a hot topic of conversation, and confusion. What are they? How are they produced? How are they tracked? Here, Enel Green Power helps explain the currency of the renewable energy market. Video Rating: / 5
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