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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.

This video covers:
– The two definitions of power
– Difference between energy transferred and work done
– How to use the power equation

General info:
– Suitable for all GCSE and IGCSE courses

Exam board specific info:
AQA – Everything is relevant to your course!
IGCSE Edexcel – Everything is relevant to your course!
Edexcel – Everything is relevant to your course!
OCR 21st Century – Everything is relevant to your course!
OCR Gateway – Everything is relevant to your course!

Watch how the Lattice Avant FPGA platform delivers up to 2.5X lower power than similar class competitive devices, helping system and application engineers achieve power efficiency while simplifying thermal management and lowering operating costs.

For more information, click here: https://www.futureelectronics.com/npi/lattice-semiconductor-avant-16nm-finfet-fpga-platform

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About Future Electronics: https://www.futureelectronics.com

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Follow me!: https://twitter.com/DoodleSci

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.

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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.
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This video covers:
– What geothermal energy is
– How it can be used to heat water or generate electricity
– It’s pros and cons

General info:
– Only relevant to AQA and IGCSE Edexcel

Exam board specific info:
AQA – Everything is relevant to your course!
IGCSE Edexcel – Everything is relevant to your course!
Edexcel – Not relevant to your course 🙁
OCR 21st Century – Not relevant to your course 🙁
OCR Gateway – Not relevant to your course 🙁

For more videos, self assessed quizzes, and worksheets visit https://www.kayscience.com

In this video, you will learn this model answer:

A device is useful because the device can transfer energy from one useful energy store to another useful energy store.

However no device is 100% efficient. This is because the device will transfer energy to non-useful energy stores.

The energy that isn’t transferred to a useful energy store is called wasted energy, or dissipated energy. The useless energy stores are usually thermal energy stores of the surroundings.

The higher the efficiency of a device the less energy is being transferred to the useless surrounding energy stores

The equation for the efficiency of an energy transfer in terms of power is:

efficiency = useful output power transfer ÷ total input power transfer
. .

Rearrange the equation for the useful output energy transfer in terms of power is:

useful output power transfer = efficiency x total input power transfer

Rearrange the equation for the total input energy transfer in terms of power is:

total input power transfer = efficiency x useful output power transfer
All content, music, images, worksheets are the property of kayscience.com

We aim for you to get 100% in your exam by revising and learning with KayScience.

In this video we cover:
– The idea that devices aren’t 100% efficient
– What efficiency is
– The equation for efficiency
– Examples of how to calculate efficiency
– Why some devices like electric heaters are sometimes considered to be 100% efficient

General info:
– Suitable for all GCSE and IGCSE courses

Exam board specific info:
AQA – Everything is relevant to your course!
IGCSE Edexcel – Everything is relevant to your course!
Edexcel – Everything is relevant to your course!
OCR 21st Century – Everything is relevant to your course!
OCR Gateway – Everything is relevant to your course!
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Energy efficiency is measured as the ratio of energy output to energy input, as a percentage. The goal of improving energy efficiency is to deliver the same service to the end user, using less energy. Learn more about energy efficiency at www.studentenergy.org

Thank you to the Alberta Real Estate Foundation for sponsoring this episode of the Energy Systems Map.

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Student Energy is currently developing the Global Youth Energy Outlook, a global youth-led report that will engage 50,000 young people around the world in 2021 to gather their perspectives on energy. Want to take part? If you’re between 18-30, head to www.bit.ly/gyeo to complete the survey! You can win 0 cash prizes in each region, or a fully funded trip to the next International Student Energy Summit!

Student Energy is a global youth-led organization empowering the next generation of leaders who are accelerating the transition to a sustainable, equitable energy future. We work with a network of 50,000 young people from over 120 countries to build the knowledge, skills, and networks they need to take action on energy. Learn more at www.studentenergy.org

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Attributions:
Glass Vectors by Vecteezy: https://www.vecteezy.com/free-vector/glass
Fruit Vectors by Vecteezy: https://www.vecteezy.com/free-vector/vector
Radiator Vectors by Vecteezy: https://www.vecteezy.com/free-vector/radiator
Meat Vectors by Vecteezy: https://www.vecteezy.com/free-vector/meat
Milk Vectors by Vecteezy: https://www.vecteezy.com/free-vector/milk
Nature Vectors by Vecteezy: https://www.vecteezy.com/free-vector/nature
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GCSE Physics Revision: Efficiency of appliances

You can watch all my videos at www.freesciencelessons.co.uk

In this video we learn about the conservation of energy and what happens to wasted energy. We then learn how to calculate the efficiency of appliances.
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You can easily find all the videos that you need on my website, along with other great revision resources. Check it out www.freesciencelessons.co.uk

In this video, we look at what is meant by efficiency of energy transfer. We learn to calculate efficiency and then I show you the most common mistake that students make in this calculation. Finally, we explore ways to increase the efficiency of energy transfer.
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