Doodle Science teaches you high school physics in a less boring way in almost no time!
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.
In this episode of Sustainable Energy, we’re taking a look at one of the most basic of energy sources and one who energizes the move from cave men to modern men : biomass and bio energy.
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In this video :
– We visit the land of komodo dragons in Indonesia to see how the nation biggest palm oil producer is improving substainability.
– A vegetable farm that’s using crop by-products to produce electricity and fertilizer.
– We are looking at technology allowing power sources to transition to biomass.
– We talk to the UK’s leading green energy company about plants to produce energy from the stuff under our feet, the grass.
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We all know that cows (and other ruminants animals like sheep) emit methane, a strong greenhouse gas. But this methane is part of a natural, or biogenic, carbon cycle where the methane breaks down into CO2 and water after about 12 years. The grass then absorbs the CO2 through photosynthesis, cows eat the grass and the cycle continues.
The CO2 from burning fossil fuel on the other hand, stays in the atmosphere for potentially 1,000 years
This animation shows how the environmental impact of methane emissions from cows is fundamentally different to the carbon dioxide from fossil fuels.
In Australia methane emissions from agriculture are falling due to the innovative emissions reduction practices and technologies that are making the red meat and livestock industry part of the climate solution. Video Rating: / 5
Delta’s Managing Director of Sustainability Amelia Deluca commits to setting science-based targets to reduce Delta’s greenhouse gas emissions. In addition, Delta has pledged it will fly on 10% sustainable aviation fuel by 2030 to help create a better world for all.
Global Citizen Live calls for action to halt climate change and for wealthy countries to deliver on the 0B climate pledge, B for famine relief, and COVID-19 vaccine justice for all. On Sept. 25, 2021, over 60M COVID-19 vaccines, 157M trees, and more than US.1B in commitments to climate, famine, and COVID-19 response efforts were announced as part of the partner-led campaign. The Global Citizen Live campaign continues in the lead-up to the G20 Summit and the United Nations Climate Change Conference (COP26) later this year.
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⭐️ About this Episode:
Finally, its time to start working on creating Hydroelectric POWER for the Off Grid Cabin. The 1st step is building a Dam to capture the water so that we can force it to the water wheel that we will be creating in upcoming episodes. Will this work? I SURE HOPE SO!!! Everything we have worked for over the past months all hinges on this idea that our cabin will be truly off grid and powered by WATER!! At best its a theory that we can create enough power to run the cabin but only time will tell. So stay tuned to see how this project comes together!
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This video explains how pumped storage hydroelectric power stations work, what their main components are and their operating characteristics.
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▶️Introduction
This type of power plant converts potential energy to electrical energy, or, electrical energy to potential energy. They achieve this by allowing water to flow from a high elevation to a lower elevation, or, by pumping water from a low elevation to a higher elevation. When water flows to a lower elevation, the power plant generates electricity. When water is pumped to a higher elevation, the power plant creates a store of potential energy. Pumped storage plants use Francis turbines because they can act as both a hydraulic pump and hydraulic turbine.
Pumped storage power plants are used to balance the frequency, voltage and power demands within the electrical grid. Pump storage plants are often utilised to add additional megawatt capacity to the grid during period of high power demand, for this reason, pumped storage plants are referred to as ‘peaking’ plants.
Because pumped storage plants can provide electrical grid operators with power ‘on-demand’, they have a high level of dispatchability (the ability to provide power to the grid as needed).
Components
Irrespective geographical location, all pumped storage plants require an upper and lower reservoir. The difference in elevation between the upper and lower reservoirs is referred to as the ‘head’ (head of pressure) and it must be significant in order for the plant to operate efficiently.
A penstock connects the upper reservoir to a Francis turbine located in the power house. A draft tube and tail race connects the Francis turbine to the lower reservoir.
Operation – Generating Power (Electricity)
Water flows from the upper reservoir, through the penstock, and to the Francis turbine. As the water passes over the Francis runner blades, a pressure differential is created that causes torque (rotary force) to be applied to the runner. The runner begins to rotate.
The turbine runner is connected on a common shaft to an electrical generator. As the runner rotates, so too does the generator rotor. As the rotor rotates through the electromagnetic field within the generator, it induces current in the stator windings and electrical current begins to flow. The electrical current is usually then dispatched to end consumers via a switchyard and electrical transformer.
Water discharged from the turbine runner enters into a draft tube where some of the kinetic energy is recovered and converted to potential energy; the water then enters the tail race and is discharged to the lower reservoir.
In this example, the potential energy of water was converted by the turbine runner into mechanical energy. The mechanical energy was transferred on a common shaft to a generator, which converted the mechanical energy to electrical energy. The entire process can be continuous until the upper reservoir is emptied.
Operation – Storing Potential Energy
Water is pumped from the lower reservoir to the upper reservoir by the Francis turbine runner. The flow path is the same as when generating electricity, except the flow direction is reversed.
Pumped Storage Economics
Pumped storage plants rely upon the varying price of electricity to make a profit. Many thermal power plants (coal fired, gas fired etc.) cannot increase or reduce their MW output quickly because this would place large thermal stresses on the power plant components (water tube boiler, piping etc.). For this reason, thermal power plants produce almost as much power at night, as they do during the day.
Most 10 Eco-Friendly Cities – Top 10 List
Many countries and city governments have been taking action in order to clean up the messes of the past. Ecology has become one of the major philosophies in all societies, as we, as a people, have a goal to leave the Earth for our descendants in a better state than when we found it. If we can follow the example set by these Top 10 Eco-Friendly Cities of the world, we’ll be well on our way to sustaining Earth for many more generations to come.
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10. Oslo, Norway
Eco-efficiency is important in this city, and it begins with grass-roots involvement. Oslo residents are encouraged to clean up, go green, and create a climate that features better air quality, eco-efficiency, biodiversity, and an abundance of clean, natural resources. The streets of Oslo look fantastic, due to local contributions being made to keep the area sustainable and highly-functioning for all of its residents.
9. Stockholm, Sweden
Stockholm is among the cleanest cities in the world. It was the first city to win the European Green Capital Award, and it has a noble long-term plan to be fossil fuel free by 2050. The riverside city is stunning and features lots of natural landscape, such as beautiful trees navigated by cycling paths. Environmental policies are prioritised in Stockholm, and as such, the streets are clean and the urban city has a country-like feel to it, despite having tall buildings and a large number of residences.
8. Columbia, Missouri, United States
Investing the time to become an eco-friendly city certainly has its benefits, such as energy reduction which in turn lowers costs and reduces greenhouse gas emissions. In Columbia, Missouri, businesses are incentivised to improve their energy efficiency though a city-wide grant system. Columbia’s City Green program determines how much energy a particular business uses, and then offers to pay for half the cost of an energy audit. Once the audit is completed, the city will pay for repairs up to ,500. To keep the city looking great, Columbia has a number of green groups, which are coalitions of like-minded people who collaborate to achieve common environmental goals. These groups clean rivers, restore animal habitats, and promote beautification, restoration, and citywide recycling.
7. Vancouver, Canada
Vancouver’s most notable performance is in the area of CO2 emissions. In The Green City Index, Vancouver boasts the lowest greenhouse gas emissions per capita of any city. Additionally, the city’s ecological goals include reducing greenhouse gas emissions by 20 percent and planting 150,000 new trees by 2020, making it one of the greenest cities on the map both literally and figuratively speaking.
6. Cape Town, Johannesburg, and Durban, South Africa
These three towns in Africa all share a spot on the greenest cities list. It is very hard to pick just one city since all these three are very strong in different categories. For example, Cape Town and Johannesburg is said to have most green spaces in the whole continent. While Durban managed to take a lead because of its target to become a zero-waste city within 20 years and carbon neutral by 2050.
5. San Francisco, United States
San Francisco used to be a capital city of the Hippy movement, but it would be wrong to say that this is the only reason this city is one of the greenest around the globe and the most ecological in North America. This city was the first in the United States to introduce the coloured bins recycling system to homes and workplaces, making recycling easy and accessible, and more importantly — legally obligatory. The fantastic public transport system and government’s encouragement for people to use more electric cars also helped San Francisco to be one of the eco-friendliest cities in the world.
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Climate change is real and it’s accelerating. Five social enterprises are responding to planet earth’s SOS with revolutionary eco-friendly solutions to tackle waste and help save the earth. From homes made of mushrooms to ink made of air pollution, here are some of Asia For Good’s favourite innovations from across the region that are shaping a greener, more sustainable future for our planet.
Please watch: “Space Mission Class 10 Notes | Maharashtra Board | Science 1 Chapter 10 | Part 1”
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Welcome Friends,
In this video you will learn | Towards Green Energy Class 10 | Towards Green Energy Class 10th | Science 2 | Chapter 5 | Part 1 | Maharashtra Board New Syllabus | 2018-19 – page 47 to 50
Points Covered-
* Energy and use of energy
* Generation of electrical energy
* Thermal energy based electric power station
— Problems
Time Stamp
0:33 What is Energy ?
0:58 What are different types of Energy ?
2:36 What are different forms of Energy ?
3:09 Energy and use of energy Class 10th
6:32 Where do we use electrical energy in our day to day life ?
7:15 How Electric energy is produced ?
7:55 Generation of Electrical Energy Class 10th
19:58 Thermal Energy based Electric Power Station Class 10th
27:08 Why the energy in coal is called chemical energy ?
28:32 Why steam is used to rotate the turbine ?
35:40 Problems of Thermal Power generation
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Under your bed, in the attic even on your mobile phone, it seems there’s never enough storage. It turns out it’s also true of energy, particularly on sustainable energy.
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– Batteries, they put power in your hand help devices but could they unlock the true potential of renewable energy?
– Could air provide storage for renewable energy when you need it? It’s not just carbon dioxyde that causes environmental issues but also black carbon. We head to Berlin to look at the potential of green solutions.
– A journey to the land of Iceland, has carbon made his match?
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