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It’s time for our second to final Physics episode. So, let’s talk Einstein and Nuclear Physics. What does E=MC2 actually mean? Why is it so useful to us as physicists and humans? In this episode of Crash Course Physics, Shini sits down to go over the basics of it all.

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0:00 Overview
0:36 Advantages and Disadvantages
1:22 3 Types of Hydro Power
1:59 Primary vs. Secondary Sources
2:52 Equation for Potential Energy
4:12 Example Problem 1
5:59 Example Problem 2

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!
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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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Energy Efficiency | Energy | Physics | FuseSchool

You may have been told that you cannot create or destroy energy, but we certainly use it – and pay for it, so what does get used up?

See our video https://youtu.be/Um04eHOqGlM where we explained that it is the usefulness of the energy that gets used as the energy is dissipated as waste heat.

CREDITS
Animation & Design: Jean-Pierre Louw (behance.net/Jean-Pierre_Louw)
Narration: Dale Bennett
Script: Bethan Parry, Keith Ross & Alistair Haynes

SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.

VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you.

These videos can be used in a flipped classroom model or as a revision aid.

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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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