Energy is everywhere around you - in your phone battery,...
Physics105 views·Updated 24 Aug 2026·6 pagesEnergy in Physics - GCSE Study Notes for CCEA
caightlin@caightlinx
1 / 6
1
of 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!
2
of 6
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.
3
of 6
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!
4
of 6
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.
5
of 6
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 (Work = Force × distance), 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 (Power = Work ÷ time) or P = E ÷ t (Power = Energy ÷ time). 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!
6
of 6
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 (m/s). 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 . 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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Physics105 views·Updated 24 Aug 2026·6 pagesEnergy 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...
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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!
4
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By signing up you accept Terms of Service and Privacy Policy
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.
5
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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 (Work = Force × distance), 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 (Power = Work ÷ time) or P = E ÷ t (Power = Energy ÷ time). 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!
6
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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 (m/s). 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 . 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!
We thought you’d never ask...
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.
Similar content
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physics aqa gcse paper 2 combined higher notes
111,26510
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Explore key concepts in Forces and Motion, including Hooke's Law, velocity, acceleration, and the principles of moments. This summary covers essential topics such as the relationship between force and extension, terminal velocity, and the impact of safety devices in physics. Ideal for AQA Physics Unit 5 revision.
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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.
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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.
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