Iceland has harnessed the potential of geothermal energy, heating 90% of its houses and producing 30% of its electricity with geothermal. Geothermal energy is very important in Iceland that relies 100% on renewables for both electricity and house heating. The cascading use of geothermal was also pioneered in Iceland and has created new industries in Iceland through the circular economy mindset of making the most of each resource. Icelandic expertise in geothermal is also a valuable export product.
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This video introduces and explains efficiency for A Level Physics.
The efficiency (η) of an object, device or machine is the ratio between the useful energy out and the total energy in or the ratio between the useful power out and the total power in. The efficiency equation is: efficiency = useful energy out/total energy in = useful power out/total power in.
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This video is recommended for anyone studying A Level Physics in the following exam boards:
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CIE
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IB
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The Waveline Magnet floats on the surface of the water and can be used for desalination, hydrogen fuel production, and electricity generation.
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Doodle Science teaches you high school physics in a less boring way in almost no time!
Script:
Different types of energy can be transferred from one type to another. You can see that a car engine transfers chemical energy, which is stored in the fuel, into kinetic energy in the engine and wheels so it can get you from A to B. In a lamp the electrical input is converted into light energy. However not all the energy put in is turned into useful energy, some of it is turned into energy we don’t need such as heat.
Sankey diagrams summarise all the energy transfers taking place in a process. The thicker the arrow, the greater the amount of energy involved. This Sankey diagram for an electric lamp shows that most of the electrical energy is transferred as heat rather than light. This means it’s very inefficient. We can calculate efficiency using this simple formula, useful energy, in this case 10J divided by the total energy input, which is 100J, which gives us an efficiency of 0.1 or 10% if you times it by 100.
Rooftop wind power has been a goal for micro power generators around the world for many years now. There’s no shortage of design ideas, but now there’s a new kid on the block that has no visible moving parts, makes no noise, and generates 50% more power than standard solar PV panels. So how do they do that?
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Apple has launched four new iPhone models: the iPhone 14 and 14 Plus, along with the iPhone 14 Pro and 14 Pro Max. The 14 Pro models feature the new Apple A16 Bionic, Apple’s latest mobile SoC. The emphasis for this latest generation of mobile processor is power efficiency.
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Writer/Narrator: Brian McManus
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Thank you to AP Archive for access to their archival footage.
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Thank you to my patreon supporters: Adam Flohr, Henning Basma, Hank Green, William Leu, Tristan Edwards, Ian Dundore, John & Becki Johnston. Nevin Spoljaric, Jason Clark, Thomas Barth, Johnny MacDonald, Stephen Foland, Alfred Holzheu, Abdulrahman Abdulaziz Binghaith, Brent Higgins, Dexter Appleberry, Alex Pavek, Marko Hirsch, Mikkel Johansen, Hibiyi Mori. Viktor Józsa, Ron Hochsprung Video Rating: / 5
