Physics covers everything from how electricity flows through circuits to...
Physics125 views·Updated 26 Jul 2026·9 pagesComprehensive Physics Paper 1 Study Notes
N
Nicole Otremba@nicoleotremba
1 / 9
1
of 9
Current and Circuit Symbols
Think about every electronic device you use - your phone, laptop, even the lights in your room. They all rely on electrical current, which is simply the flow of electrical charge around a circuit.
Current only flows when there's a complete circuit and a potential difference (voltage) to push the charge around. The current is measured in amperes (A), whilst potential difference uses volts (V). In any single loop circuit, the current stays exactly the same everywhere.
Resistance acts like a roadblock, slowing down the current flow - it's measured in ohms (Ω). The more resistance a component has, the less current flows through it. You can work out how much charge flows using the equation Q = It (charge = current × time).
Quick Tip: Learning circuit symbols is like learning a new language - once you know them, you can read any electrical diagram!
2
of 9
Energy Stores and Systems
Energy never just disappears - it moves between different energy stores like a cosmic game of pass-the-parcel. There are eight main types: thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, and nuclear energy stores.
Energy gets transferred in four main ways: mechanically (forces doing work), electrically (moving charges), by heating, or by radiation. When you boil water in a kettle, electrical energy transfers to the water's thermal energy store, making it hotter.
Work done is just another way of saying energy transferred. When you throw a ball upwards, chemical energy from your muscles transfers to kinetic energy in your arm, then to the ball's kinetic and gravitational potential energy stores. In closed systems, the total energy never changes - it just moves around.
Remember: Energy is like money - it can't be created or destroyed, only moved from one account to another!
3
of 9
Kinetic and Potential Energy
Moving objects store energy in their kinetic energy store - the faster and heavier something is, the more energy it has. You can calculate this using Ek = ½mv² (kinetic energy = ½ × mass × speed²).
When you lift something up, you're transferring energy to its gravitational potential energy store. The higher and heavier the object, the more energy it stores. Use Ep = mgh (gravitational potential energy = mass × gravitational field strength × height) to work this out.
Falling objects are brilliant examples of energy transfer - as they fall, gravitational potential energy converts to kinetic energy. Without air resistance, the energy lost from the gravitational store exactly equals the energy gained in the kinetic store. Elastic potential energy works similarly when you stretch springs, using Ee = ½ke².
Physics Fact: A falling apple transfers the same amount of energy whether it falls slowly or quickly - it just happens at different rates!
4
of 9
Energy Resources and Their Uses
Energy resources split into two camps: non-renewable (which will run out) and renewable (which won't). Non-renewable includes fossil fuels (coal, oil, natural gas) and nuclear fuels like uranium. These provide most of our energy but damage the environment.
Renewable resources include wind, solar, waves, hydro-electricity, bio-fuel, tides, and geothermal energy. They're cleaner but often provide less energy and can be unreliable - you can't control when the wind blows or sun shines!
Both types power our transport and heat our homes. Petrol cars use oil-derived fuel, whilst some vehicles run on bio-fuels. For heating, natural gas warms most UK homes through radiators, while renewable options include solar water heaters and geothermal systems.
Think About It: Every time you switch on a light or charge your phone, you're using energy that might have come from ancient plants that lived millions of years ago!
5
of 9
Efficiency
No device is perfect - some input energy always gets wasted, usually as unwanted thermal energy. The more energy a device wastes, the less efficient it is. You can improve efficiency by insulating objects, lubricating moving parts, or making them more streamlined.
Efficiency calculations help us compare devices: Efficiency = Useful energy output ÷ Total energy input. You can also use power instead of energy in this equation. Most devices aren't 100% efficient, except electrical heaters where all the electrical energy usefully becomes heat.
Understanding efficiency helps you choose better appliances and understand why energy bills matter. Even the most efficient devices eventually transfer all their energy to thermal energy stores, which is why your phone gets warm when you use it lots.
Energy Tip: Look for energy efficiency ratings when buying appliances - they'll save you money and help the environment!
6
of 9
Hydro-electricity, Waves and Tides
Hydro-electric power uses falling water to turn turbines and generate electricity. It requires flooding valleys with dams, which can destroy habitats but produces no pollution during operation. These plants respond quickly to electricity demand but have high setup costs.
Wave power uses lots of small turbines around coastlines. Waves are fairly unreliable since they depend on wind, and the turbines can disturb marine life. They'll never provide large-scale energy but work well for smaller applications.
Tidal barrages are dams built across river estuaries that use the moon and sun's gravitational pull. Tides happen twice daily without fail, making them more reliable than waves. However, tide height varies, affecting energy output, and they can only work in suitable estuaries.
Nature's Power: The same gravitational forces that created our solar system now help generate electricity through tidal power!
7
of 9
Wind, Solar and Geothermal
Wind turbines need about 1,500 units to replace one coal power station, and they only work 70-85% of the time. They're noisy and some people think they spoil views, but they produce no pollution during operation and cause no permanent environmental damage.
Solar cells convert sunlight directly into electricity - perfect for calculators, remote road signs, and satellites. They're expensive initially but free to run afterwards. Solar power works brilliantly in sunny countries but obviously only during daylight hours.
Geothermal power taps into underground thermal energy stores from radioactive decay in rocks. It's only possible in volcanic areas or where hot rocks lie near the surface. This reliable, clean energy source can generate electricity or heat buildings directly.
Cool Fact: The same nuclear processes that power the sun also create geothermal energy deep underground!
8
of 9
Bio-fuels and Non-renewables
Bio-fuels come from plants and animal waste - they can be solid, liquid, or gas. They're supposedly carbon neutral if you grow plants as fast as you burn them. However, refining costs are high, and growing fuel crops might reduce food production or destroy forests.
Non-renewable resources are incredibly reliable - there's always fuel available, and power plants can quickly respond to demand changes. They're currently the most cost-effective way to produce energy, with reasonable setup and running costs.
Unfortunately, non-renewables create serious environmental problems. Fossil fuels release carbon dioxide (contributing to global warming) and sulfur dioxide (causing acid rain). Nuclear power is clean during operation but creates dangerous radioactive waste and carries catastrophe risks.
Reality Check: Coal mining and oil spills show how our energy choices affect landscapes and wildlife for generations.
9
of 9
Trends in Energy Resource Use
We still depend heavily on fossil fuels for electricity, transport, and heating, though 21st-century UK electricity use has decreased thanks to more efficient appliances. People are becoming more energy-conscious, and renewable electricity use is gradually increasing.
Growing environmental awareness and the reality that non-renewable resources will run out drives demand for renewable energy. Government pressure and public opinion are pushing the introduction of more renewable sources, whilst electric and hybrid cars are becoming increasingly popular.
However, reliability, money, and politics limit renewable energy adoption. New power plants cost money, and energy companies find fossil fuels more cost-effective. Public protests about wind farm locations, unreliable energy output, and expensive personal changes like solar panels or hybrid cars all slow progress.
Future Focus: Scientific evidence exists, but changing government and company behaviour takes time - your generation will likely solve these energy challenges!
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Physics125 views·Updated 26 Jul 2026·9 pagesComprehensive Physics Paper 1 Study Notes
N
Nicole Otremba@nicoleotremba
Physics covers everything from how electricity flows through circuits to where we get our energy from. Understanding these concepts helps explain how the devices we use daily work and why we need to think carefully about our energy choices for...
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of 9
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Current and Circuit Symbols
Think about every electronic device you use - your phone, laptop, even the lights in your room. They all rely on electrical current, which is simply the flow of electrical charge around a circuit.
Current only flows when there's a complete circuit and a potential difference (voltage) to push the charge around. The current is measured in amperes (A), whilst potential difference uses volts (V). In any single loop circuit, the current stays exactly the same everywhere.
Resistance acts like a roadblock, slowing down the current flow - it's measured in ohms (Ω). The more resistance a component has, the less current flows through it. You can work out how much charge flows using the equation Q = It (charge = current × time).
Quick Tip: Learning circuit symbols is like learning a new language - once you know them, you can read any electrical diagram!
2
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Energy Stores and Systems
Energy never just disappears - it moves between different energy stores like a cosmic game of pass-the-parcel. There are eight main types: thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, and nuclear energy stores.
Energy gets transferred in four main ways: mechanically (forces doing work), electrically (moving charges), by heating, or by radiation. When you boil water in a kettle, electrical energy transfers to the water's thermal energy store, making it hotter.
Work done is just another way of saying energy transferred. When you throw a ball upwards, chemical energy from your muscles transfers to kinetic energy in your arm, then to the ball's kinetic and gravitational potential energy stores. In closed systems, the total energy never changes - it just moves around.
Remember: Energy is like money - it can't be created or destroyed, only moved from one account to another!
3
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Kinetic and Potential Energy
Moving objects store energy in their kinetic energy store - the faster and heavier something is, the more energy it has. You can calculate this using Ek = ½mv² (kinetic energy = ½ × mass × speed²).
When you lift something up, you're transferring energy to its gravitational potential energy store. The higher and heavier the object, the more energy it stores. Use Ep = mgh (gravitational potential energy = mass × gravitational field strength × height) to work this out.
Falling objects are brilliant examples of energy transfer - as they fall, gravitational potential energy converts to kinetic energy. Without air resistance, the energy lost from the gravitational store exactly equals the energy gained in the kinetic store. Elastic potential energy works similarly when you stretch springs, using Ee = ½ke².
Physics Fact: A falling apple transfers the same amount of energy whether it falls slowly or quickly - it just happens at different rates!
4
of 9Sign up to see the content. It's free!
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- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Energy Resources and Their Uses
Energy resources split into two camps: non-renewable (which will run out) and renewable (which won't). Non-renewable includes fossil fuels (coal, oil, natural gas) and nuclear fuels like uranium. These provide most of our energy but damage the environment.
Renewable resources include wind, solar, waves, hydro-electricity, bio-fuel, tides, and geothermal energy. They're cleaner but often provide less energy and can be unreliable - you can't control when the wind blows or sun shines!
Both types power our transport and heat our homes. Petrol cars use oil-derived fuel, whilst some vehicles run on bio-fuels. For heating, natural gas warms most UK homes through radiators, while renewable options include solar water heaters and geothermal systems.
Think About It: Every time you switch on a light or charge your phone, you're using energy that might have come from ancient plants that lived millions of years ago!
5
of 9Sign up to see the content. It's free!
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Efficiency
No device is perfect - some input energy always gets wasted, usually as unwanted thermal energy. The more energy a device wastes, the less efficient it is. You can improve efficiency by insulating objects, lubricating moving parts, or making them more streamlined.
Efficiency calculations help us compare devices: Efficiency = Useful energy output ÷ Total energy input. You can also use power instead of energy in this equation. Most devices aren't 100% efficient, except electrical heaters where all the electrical energy usefully becomes heat.
Understanding efficiency helps you choose better appliances and understand why energy bills matter. Even the most efficient devices eventually transfer all their energy to thermal energy stores, which is why your phone gets warm when you use it lots.
Energy Tip: Look for energy efficiency ratings when buying appliances - they'll save you money and help the environment!
6
of 9Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Hydro-electricity, Waves and Tides
Hydro-electric power uses falling water to turn turbines and generate electricity. It requires flooding valleys with dams, which can destroy habitats but produces no pollution during operation. These plants respond quickly to electricity demand but have high setup costs.
Wave power uses lots of small turbines around coastlines. Waves are fairly unreliable since they depend on wind, and the turbines can disturb marine life. They'll never provide large-scale energy but work well for smaller applications.
Tidal barrages are dams built across river estuaries that use the moon and sun's gravitational pull. Tides happen twice daily without fail, making them more reliable than waves. However, tide height varies, affecting energy output, and they can only work in suitable estuaries.
Nature's Power: The same gravitational forces that created our solar system now help generate electricity through tidal power!
7
of 9Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Wind, Solar and Geothermal
Wind turbines need about 1,500 units to replace one coal power station, and they only work 70-85% of the time. They're noisy and some people think they spoil views, but they produce no pollution during operation and cause no permanent environmental damage.
Solar cells convert sunlight directly into electricity - perfect for calculators, remote road signs, and satellites. They're expensive initially but free to run afterwards. Solar power works brilliantly in sunny countries but obviously only during daylight hours.
Geothermal power taps into underground thermal energy stores from radioactive decay in rocks. It's only possible in volcanic areas or where hot rocks lie near the surface. This reliable, clean energy source can generate electricity or heat buildings directly.
Cool Fact: The same nuclear processes that power the sun also create geothermal energy deep underground!
8
of 9Sign up to see the content. It's free!
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- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Bio-fuels and Non-renewables
Bio-fuels come from plants and animal waste - they can be solid, liquid, or gas. They're supposedly carbon neutral if you grow plants as fast as you burn them. However, refining costs are high, and growing fuel crops might reduce food production or destroy forests.
Non-renewable resources are incredibly reliable - there's always fuel available, and power plants can quickly respond to demand changes. They're currently the most cost-effective way to produce energy, with reasonable setup and running costs.
Unfortunately, non-renewables create serious environmental problems. Fossil fuels release carbon dioxide (contributing to global warming) and sulfur dioxide (causing acid rain). Nuclear power is clean during operation but creates dangerous radioactive waste and carries catastrophe risks.
Reality Check: Coal mining and oil spills show how our energy choices affect landscapes and wildlife for generations.
9
of 9Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Trends in Energy Resource Use
We still depend heavily on fossil fuels for electricity, transport, and heating, though 21st-century UK electricity use has decreased thanks to more efficient appliances. People are becoming more energy-conscious, and renewable electricity use is gradually increasing.
Growing environmental awareness and the reality that non-renewable resources will run out drives demand for renewable energy. Government pressure and public opinion are pushing the introduction of more renewable sources, whilst electric and hybrid cars are becoming increasingly popular.
However, reliability, money, and politics limit renewable energy adoption. New power plants cost money, and energy companies find fossil fuels more cost-effective. Public protests about wind farm locations, unreliable energy output, and expensive personal changes like solar panels or hybrid cars all slow progress.
Future Focus: Scientific evidence exists, but changing government and company behaviour takes time - your generation will likely solve these energy challenges!
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.
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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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