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21 Nov 2025
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Energy in Physics - GCSE Study Notes for CCEA
caightlin
@caightlinx
1 / 6
Forms of Energy and Conservation
Energy comes in loads of different forms, and they're all around you every day. Chemical energy is stored in batteries, food, and fuel, whilst kinetic energy is the energy of moving objects. You've also got electrical energy (powering your devices), heat energy (from radiators), light energy (from the sun), and sound energy (from your music).
Here's the brilliant bit: energy can never be created or destroyed - this is called the Principle of Conservation of Energy. Energy just changes from one form to another. When you strike a match, chemical energy transforms into heat and light energy. When you speak into a microphone, your sound energy becomes electrical energy.
Energy is measured in Joules (J) - think of 1 Joule as roughly the energy needed to lift an apple one metre high. Simple examples include your phone battery converting chemical energy to electrical energy, or a car engine changing chemical energy from petrol into kinetic energy to make you move.
Quick Tip: Remember "My Granny Sees Every Kid Stealing Her Lemon Cake" to recall the energy types: Magnetic, Gravitational, Sound, Electrical, Kinetic, Strain, Heat, Light, Chemical!
Renewable Energy Resources
Renewable energy comes from sources that won't run out in your lifetime - they're naturally replenished and incredibly important for our planet's future. These energy sources don't produce harmful gases and have no fuel costs, making them brilliant for the environment.
Solar energy uses sunlight converted by solar cells into electricity - you'll see these powering road signs and satellites. Wind energy uses massive turbines with huge blades to convert kinetic energy from moving air into electricity. Hydroelectric power (HEP) harnesses moving water, often from dams, to drive electrical generators - it's super reliable and easily controlled.
Wood energy can be renewable if trees are replanted after being chopped down and burnt for electricity. Each of these transforms different energy types (light → electrical, kinetic → electrical, chemical → electrical) but they all share the same benefit: they won't run out!
Did You Know? Wind farms are often built in the windiest locations possible to maximise energy generation - that's why you'll see them on hills and coastlines.
More Renewable Sources
Tidal energy uses the massive movement of water in and out of river mouths - tidal barrages contain electricity generators driven by rushing water. It's incredibly reliable because tides are predictable, but these barrages can damage habitats where birds and fish live.
Wave energy captures the kinetic energy from rising and falling sea water using wave machines to drive electricity generators. Whilst it produces no pollution, it's tricky to build machines large enough to generate substantial amounts of electricity.
Geothermal energy taps into hot water and steam from deep underground to drive turbines and create electricity. It's fantastic because it produces no harmful gases, but most places don't have suitable underground conditions, and the generating stations can be expensive to build.
Remember: All these renewable sources convert kinetic or thermal energy into electrical energy - they're just using different natural movements and heat sources!
Non-Renewable Energy Resources
Non-renewable resources have a finite supply and will eventually run out - they're the opposite of renewable sources. The main types are fossil fuels and nuclear energy, and whilst they're currently essential for our energy needs, they come with significant drawbacks.
Fossil fuels (coal, oil, and gas) formed from dead organisms millions of years ago. They're relatively cheap and easy to obtain, but burning them releases harmful gases. Coal and oil produce sulphur dioxide (causing breathing problems and acid rain) and carbon dioxide (contributing to global warming and climate change).
Nuclear energy uses uranium fuel in controlled chain reactions to produce heat, turning water into steam that drives turbines. Nuclear doesn't emit greenhouse gases, but uranium supplies won't last forever. The major concerns include potential accidents releasing radioactive material, nuclear waste staying hazardous for thousands of years, and the extremely expensive cost of safely shutting down nuclear plants.
Key Point: Both fossil fuels and nuclear energy follow the same process: fuel creates heat → water becomes steam → steam turns turbines → turbines generate electricity.
Efficiency, Work, and Power
Efficiency measures how good a machine is at transferring energy - basically, how much useful energy you get out compared to what you put in. Calculate it using: Efficiency = useful energy out ÷ total energy in. Efficiency is always less than 1 (or 100%) because energy can't be created from nothing!
Work is simply energy transferred when a force moves something. The equation is W = Fd , where distance must be in the direction of the force. If you're lifting something, use W = mg to find the force first, then multiply by the height.
Power measures how fast energy is transferred - it's the rate of doing work. Measured in watts (W), where 1 watt = 1 Joule per second. Use P = W ÷ t or P = E ÷ t . Remember: 1 kilowatt = 1,000W and 1 megawatt = 1,000,000W.
Real Example: When you run upstairs, you're doing work against gravity - the faster you go, the more power you're generating!
Kinetic and Potential Energy
Kinetic energy is the energy something has because it's moving - the faster and heavier an object, the more kinetic energy it possesses. Calculate it using Ek = ½mv² where m is mass (kg) and v is velocity . A speeding car has loads more kinetic energy than a walking person.
Potential energy is stored energy due to position - specifically height above the ground. Use Ep = mgh where m is mass (kg), g is gravity , and h is height (m). The higher something is, the more potential energy it has.
These energies constantly transform into each other following conservation of energy. When you throw a ball upwards, it slows down (loses kinetic energy) but gains height (gains potential energy). As it falls back down, it loses potential energy but gains kinetic energy as it speeds up. The total energy always stays the same.
Cool Fact: At the highest point of a thrown ball's path, all its energy is potential - it has zero kinetic energy because it's momentarily not moving!
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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
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David K
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Greenlight Bonnie
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Energy in Physics - GCSE Study Notes for CCEA
caightlin
@caightlinx
Energy is everywhere around you - in your phone battery, the food you eat, and even when you're walking up the stairs! Understanding how energy works, transforms, and powers our world is crucial for understanding everything from why your phone... Show more
Forms of Energy and Conservation
Energy comes in loads of different forms, and they're all around you every day. Chemical energy is stored in batteries, food, and fuel, whilst kinetic energy is the energy of moving objects. You've also got electrical energy (powering your devices), heat energy (from radiators), light energy (from the sun), and sound energy (from your music).
Here's the brilliant bit: energy can never be created or destroyed - this is called the Principle of Conservation of Energy. Energy just changes from one form to another. When you strike a match, chemical energy transforms into heat and light energy. When you speak into a microphone, your sound energy becomes electrical energy.
Energy is measured in Joules (J) - think of 1 Joule as roughly the energy needed to lift an apple one metre high. Simple examples include your phone battery converting chemical energy to electrical energy, or a car engine changing chemical energy from petrol into kinetic energy to make you move.
Quick Tip: Remember "My Granny Sees Every Kid Stealing Her Lemon Cake" to recall the energy types: Magnetic, Gravitational, Sound, Electrical, Kinetic, Strain, Heat, Light, Chemical!
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Renewable Energy Resources
Renewable energy comes from sources that won't run out in your lifetime - they're naturally replenished and incredibly important for our planet's future. These energy sources don't produce harmful gases and have no fuel costs, making them brilliant for the environment.
Solar energy uses sunlight converted by solar cells into electricity - you'll see these powering road signs and satellites. Wind energy uses massive turbines with huge blades to convert kinetic energy from moving air into electricity. Hydroelectric power (HEP) harnesses moving water, often from dams, to drive electrical generators - it's super reliable and easily controlled.
Wood energy can be renewable if trees are replanted after being chopped down and burnt for electricity. Each of these transforms different energy types (light → electrical, kinetic → electrical, chemical → electrical) but they all share the same benefit: they won't run out!
Did You Know? Wind farms are often built in the windiest locations possible to maximise energy generation - that's why you'll see them on hills and coastlines.
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More Renewable Sources
Tidal energy uses the massive movement of water in and out of river mouths - tidal barrages contain electricity generators driven by rushing water. It's incredibly reliable because tides are predictable, but these barrages can damage habitats where birds and fish live.
Wave energy captures the kinetic energy from rising and falling sea water using wave machines to drive electricity generators. Whilst it produces no pollution, it's tricky to build machines large enough to generate substantial amounts of electricity.
Geothermal energy taps into hot water and steam from deep underground to drive turbines and create electricity. It's fantastic because it produces no harmful gases, but most places don't have suitable underground conditions, and the generating stations can be expensive to build.
Remember: All these renewable sources convert kinetic or thermal energy into electrical energy - they're just using different natural movements and heat sources!
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Non-Renewable Energy Resources
Non-renewable resources have a finite supply and will eventually run out - they're the opposite of renewable sources. The main types are fossil fuels and nuclear energy, and whilst they're currently essential for our energy needs, they come with significant drawbacks.
Fossil fuels (coal, oil, and gas) formed from dead organisms millions of years ago. They're relatively cheap and easy to obtain, but burning them releases harmful gases. Coal and oil produce sulphur dioxide (causing breathing problems and acid rain) and carbon dioxide (contributing to global warming and climate change).
Nuclear energy uses uranium fuel in controlled chain reactions to produce heat, turning water into steam that drives turbines. Nuclear doesn't emit greenhouse gases, but uranium supplies won't last forever. The major concerns include potential accidents releasing radioactive material, nuclear waste staying hazardous for thousands of years, and the extremely expensive cost of safely shutting down nuclear plants.
Key Point: Both fossil fuels and nuclear energy follow the same process: fuel creates heat → water becomes steam → steam turns turbines → turbines generate electricity.
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Improve your grades
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Efficiency, Work, and Power
Efficiency measures how good a machine is at transferring energy - basically, how much useful energy you get out compared to what you put in. Calculate it using: Efficiency = useful energy out ÷ total energy in. Efficiency is always less than 1 (or 100%) because energy can't be created from nothing!
Work is simply energy transferred when a force moves something. The equation is W = Fd , where distance must be in the direction of the force. If you're lifting something, use W = mg to find the force first, then multiply by the height.
Power measures how fast energy is transferred - it's the rate of doing work. Measured in watts (W), where 1 watt = 1 Joule per second. Use P = W ÷ t or P = E ÷ t . Remember: 1 kilowatt = 1,000W and 1 megawatt = 1,000,000W.
Real Example: When you run upstairs, you're doing work against gravity - the faster you go, the more power you're generating!
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Kinetic and Potential Energy
Kinetic energy is the energy something has because it's moving - the faster and heavier an object, the more kinetic energy it possesses. Calculate it using Ek = ½mv² where m is mass (kg) and v is velocity . A speeding car has loads more kinetic energy than a walking person.
Potential energy is stored energy due to position - specifically height above the ground. Use Ep = mgh where m is mass (kg), g is gravity , and h is height (m). The higher something is, the more potential energy it has.
These energies constantly transform into each other following conservation of energy. When you throw a ball upwards, it slows down (loses kinetic energy) but gains height (gains potential energy). As it falls back down, it loses potential energy but gains kinetic energy as it speeds up. The total energy always stays the same.
Cool Fact: At the highest point of a thrown ball's path, all its energy is potential - it has zero kinetic energy because it's momentarily not moving!
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user