Maths
Chemistry
Biology
English Language
History
Responding to change (a2 only)
Infection and response
Homeostasis and response
Energy transfers (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
Ecology
Cells
Show all topics
Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
Show all topics
Physics
6 Dec 2025
242
4 pages
isaac @isaac_pcpe
Understanding energy resources is crucial for tackling climate change and building a sustainable future. This topic covers the... Show more
Fossil fuels are the energy sources that power most of our world today, but they come with serious problems. These non-renewable resources like coal, oil, and natural gas can only be used once before they're gone forever. Once you burn coal for electricity, that coal is finished - there's no getting it back.
The environmental impact of fossil fuels makes them particularly concerning. When we burn these fuels, they release harmful gases that contribute to climate change and air pollution.
Understanding which energy sources are renewable versus non-renewable helps you grasp why scientists are pushing for change. Renewable sources like wind, solar, hydroelectricity, and wave energy can be used repeatedly, whilst non-renewable ones like oil, coal, natural gas, and nuclear fuel have limited supplies.
Quick Check Remember that biofuels, despite being made from plants, are actually renewable because we can always grow more crops to make them!
Renewable energy sources can theoretically be used infinitely - wind will always blow, waves will always move, and the sun will always shine. They're much better for the environment than fossil fuels, though they often cost more to set up initially.
So why haven't we switched completely to renewables yet? Fossil fuels are considered more reliable because we've been using them for decades and know exactly how to extract energy from them efficiently. They're easily available and provide consistent power regardless of weather conditions.
The economics make change difficult too. Despite massive UK government investment in wind power, fossil fuel use hasn't declined significantly. This happens because fossil fuel companies make enormous profits and resist change, whilst our energy infrastructure isn't ready to rely completely on renewables yet.
Having a "blend" of energy sources rather than depending solely on coal gives us flexibility and helps different sectors see which alternatives might be profitable. This approach allows for gradual transition rather than sudden, disruptive change.
Think About It Even with 60 years of renewable energy development, we're still working on making the transition from fossil fuels - change takes time!
Looking at renewable energy consumption over 60 years reveals interesting patterns. Wood energy hasn't increased much because burning wood still involves deforestation and emissions - other renewable sources are simply more environmentally friendly.
Wind turbines represent a classic renewable energy challenge. Despite huge investments, wind power doesn't produce as much energy as other renewable sources. This happens because many people consider turbines an eyesore and don't want them nearby, plus they're expensive to install compared to alternatives.
The key is matching the right energy source to each situation. Cars can run on biofuels or gas, whilst electricity production works well with wind or solar power. Home heating might use coal or geothermal energy, and trains can be powered by coal or solar.
Understanding these practical applications helps you see why we need multiple energy sources rather than relying on just one type.
Real World The "not in my backyard" attitude towards wind turbines shows how social acceptance affects renewable energy adoption, not just technology!
Human activities have significantly worsened the greenhouse effect, primarily through burning fossil fuels. When we burn coal, oil, and natural gas for electricity, heating, and transport, we release greenhouse gases that trap heat in Earth's atmosphere.
This connection between energy choices and climate change explains why switching to renewable sources matters so much. Every fossil fuel we burn adds to the problem, whilst renewable energy sources produce little to no greenhouse gas emissions.
The challenge lies in balancing our immediate energy needs with long-term environmental protection. We need reliable energy for modern life, but we also need to reduce our impact on the planet's climate systems.
Key Takeaway Your energy choices today - from how your home is heated to supporting renewable energy policies - directly impact the greenhouse effect and climate change!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
2
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the fundamentals of mains electricity and the National Grid in this GCSE Physics summary. Learn about alternating current, the roles of live, neutral, and earth wires, and the function of transformers in energy transfer. This resource covers key concepts in electricity generation and supply, essential for your studies.
PhysicsExplore the key concepts of energy resources, including fossil fuels, renewable energy, and energy efficiency. This summary covers advantages and disadvantages of various energy sources, equations for energy calculations, and practical investigations related to thermal insulation and energy transfer. Ideal for GCSE Physics students preparing for AQA Higher Triple exams.
PhysicsDive into the fundamentals of renewable energy, covering key sources such as solar, wind, geothermal, and biomass. This summary highlights advantages, disadvantages, and the future of energy consumption trends. Ideal for students seeking to understand sustainable energy solutions and their impact on the environment.
PhysicsDive into the fundamentals of power and energy in physics with this comprehensive summary. Explore key concepts such as voltage, current, and energy calculations, including practical examples and practice questions. Perfect for mastering electrostatics and domestic electricity. Type: Summary.
PhysicsDive into the advantages and disadvantages of various energy sources, including renewable options like biofuels, wind, and solar power, as well as non-renewable resources such as fossil fuels and nuclear energy. This summary covers energy efficiency, energy transfers, and the impact of each source on the environment, making it essential for understanding energy systems and sustainability.
PhysicsExplore key principles of energy, including kinetic and potential energy, conservation of energy, and various energy resources. This summary covers essential equations, energy transformations, and the efficiency of energy use, tailored for GCSE Physics students. Ideal for exam preparation and understanding fundamental energy concepts.
PhysicsThis is the aqa exam board for triple highwe
ChemistryApp Store
Google Play
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
isaac
@isaac_pcpe
Understanding energy resources is crucial for tackling climate change and building a sustainable future. This topic covers the differences between renewable and non-renewable energy sources, examining why we're still heavily dependent on fossil fuels despite growing investment in cleaner alternatives.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Fossil fuels are the energy sources that power most of our world today, but they come with serious problems. These non-renewable resources like coal, oil, and natural gas can only be used once before they're gone forever. Once you burn coal for electricity, that coal is finished - there's no getting it back.
The environmental impact of fossil fuels makes them particularly concerning. When we burn these fuels, they release harmful gases that contribute to climate change and air pollution.
Understanding which energy sources are renewable versus non-renewable helps you grasp why scientists are pushing for change. Renewable sources like wind, solar, hydroelectricity, and wave energy can be used repeatedly, whilst non-renewable ones like oil, coal, natural gas, and nuclear fuel have limited supplies.
Quick Check: Remember that biofuels, despite being made from plants, are actually renewable because we can always grow more crops to make them!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Renewable energy sources can theoretically be used infinitely - wind will always blow, waves will always move, and the sun will always shine. They're much better for the environment than fossil fuels, though they often cost more to set up initially.
So why haven't we switched completely to renewables yet? Fossil fuels are considered more reliable because we've been using them for decades and know exactly how to extract energy from them efficiently. They're easily available and provide consistent power regardless of weather conditions.
The economics make change difficult too. Despite massive UK government investment in wind power, fossil fuel use hasn't declined significantly. This happens because fossil fuel companies make enormous profits and resist change, whilst our energy infrastructure isn't ready to rely completely on renewables yet.
Having a "blend" of energy sources rather than depending solely on coal gives us flexibility and helps different sectors see which alternatives might be profitable. This approach allows for gradual transition rather than sudden, disruptive change.
Think About It: Even with 60 years of renewable energy development, we're still working on making the transition from fossil fuels - change takes time!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Looking at renewable energy consumption over 60 years reveals interesting patterns. Wood energy hasn't increased much because burning wood still involves deforestation and emissions - other renewable sources are simply more environmentally friendly.
Wind turbines represent a classic renewable energy challenge. Despite huge investments, wind power doesn't produce as much energy as other renewable sources. This happens because many people consider turbines an eyesore and don't want them nearby, plus they're expensive to install compared to alternatives.
The key is matching the right energy source to each situation. Cars can run on biofuels or gas, whilst electricity production works well with wind or solar power. Home heating might use coal or geothermal energy, and trains can be powered by coal or solar.
Understanding these practical applications helps you see why we need multiple energy sources rather than relying on just one type.
Real World: The "not in my backyard" attitude towards wind turbines shows how social acceptance affects renewable energy adoption, not just technology!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Human activities have significantly worsened the greenhouse effect, primarily through burning fossil fuels. When we burn coal, oil, and natural gas for electricity, heating, and transport, we release greenhouse gases that trap heat in Earth's atmosphere.
This connection between energy choices and climate change explains why switching to renewable sources matters so much. Every fossil fuel we burn adds to the problem, whilst renewable energy sources produce little to no greenhouse gas emissions.
The challenge lies in balancing our immediate energy needs with long-term environmental protection. We need reliable energy for modern life, but we also need to reduce our impact on the planet's climate systems.
Key Takeaway: Your energy choices today - from how your home is heated to supporting renewable energy policies - directly impact the greenhouse effect and climate change!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
2
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the fundamentals of mains electricity and the National Grid in this GCSE Physics summary. Learn about alternating current, the roles of live, neutral, and earth wires, and the function of transformers in energy transfer. This resource covers key concepts in electricity generation and supply, essential for your studies.
PhysicsExplore the key concepts of energy resources, including fossil fuels, renewable energy, and energy efficiency. This summary covers advantages and disadvantages of various energy sources, equations for energy calculations, and practical investigations related to thermal insulation and energy transfer. Ideal for GCSE Physics students preparing for AQA Higher Triple exams.
PhysicsDive into the fundamentals of renewable energy, covering key sources such as solar, wind, geothermal, and biomass. This summary highlights advantages, disadvantages, and the future of energy consumption trends. Ideal for students seeking to understand sustainable energy solutions and their impact on the environment.
PhysicsDive into the fundamentals of power and energy in physics with this comprehensive summary. Explore key concepts such as voltage, current, and energy calculations, including practical examples and practice questions. Perfect for mastering electrostatics and domestic electricity. Type: Summary.
PhysicsDive into the advantages and disadvantages of various energy sources, including renewable options like biofuels, wind, and solar power, as well as non-renewable resources such as fossil fuels and nuclear energy. This summary covers energy efficiency, energy transfers, and the impact of each source on the environment, making it essential for understanding energy systems and sustainability.
PhysicsExplore key principles of energy, including kinetic and potential energy, conservation of energy, and various energy resources. This summary covers essential equations, energy transformations, and the efficiency of energy use, tailored for GCSE Physics students. Ideal for exam preparation and understanding fundamental energy concepts.
PhysicsThis is the aqa exam board for triple highwe
ChemistryApp Store
Google Play
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
Sociology