Energy and electricity are fundamental topics that explain how our... Show more
Physics782 views·Updated Jun 3, 2026·4 pagesGCSE AQA Physics Energy and Electricity Notes for Paper 1
Kay <3@n1ghtks
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Energy Stores and Transfers
When we talk about energy, we're looking at how it's stored in systems (objects or groups of objects) and how it moves around. Energy is always on the move!
For example, when a rolling ball hits a wall, its kinetic energy (movement energy) doesn't disappear—it transforms into sound energy. Similarly, when a car slows down, friction converts kinetic energy into thermal energy (heat). This follows the principle that energy cannot be created or destroyed, only transferred or transformed.
Power measures how quickly energy is transferred and is calculated as: power = energy transferred ÷ time. It's measured in watts (W), where 1 watt means 1 joule of energy is transferred every second.
Remember this! Energy might be "wasted" when it's dissipated into less useful forms, but we can reduce this waste. For instance, lubricating moving parts reduces friction and minimizes energy lost as heat.
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Energy Resources
Our world relies on a mix of energy sources that fall into two main categories: renewable and non-renewable. Non-renewable sources include fossil fuels (coal, oil, gas) and nuclear fuel, while renewable sources include wind, solar, hydroelectric, tidal, geothermal and biofuels.
The key difference? Renewable sources can be replenished naturally, while non-renewable sources exist in finite amounts. Though non-renewables typically provide high energy output, they won't last forever. Different sectors—transportation, electricity generation, and heating—have different energy requirements.
Fossil fuels dominated during the Industrial Revolution because they were easily accessible and energy-rich. However, their environmental impact includes harmful emissions, landscape damage, and contribution to climate change.
Did you know? The adoption of renewable energy has significantly increased in recent years thanks to technological advancements and growing environmental awareness. You're witnessing this energy revolution happening right now!
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of 4
Circuit Fundamentals
Electricity only flows when circuits are complete with no breaks. A source of potential difference (like a battery) provides the electrical "push" needed for charge to flow.
Electrical current is the flow of electrical charge, represented by the symbol I. The relationship between current (I), potential difference (V), and resistance (R) is defined by Ohm's Law: I = V/R. This means that higher resistance leads to lower current when voltage stays the same.
Several factors affect resistance in a circuit. Resistance increases with wire length as electrons must pass through more atoms. For special components like thermistors, resistance decreases with higher temperatures, allowing more current to flow. In Light Dependent Resistors (LDRs), resistance decreases with increased light intensity.
Top tip: Think of electrical circuits like water flowing through pipes. Resistance is like a narrowing in the pipe—the narrower the pipe (higher resistance), the less water (current) can flow through.
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Electrical Circuits
Diodes are fascinating components that act like one-way gates in circuits. They allow current to flow freely in one direction but block it from flowing the opposite way with very high resistance.
In series circuits, current follows just one path, so the current is the same at every point. When resistors are connected in series, their resistances add up: total resistance = R1 + R2 + R3.
Parallel circuits offer multiple paths for current to travel. At each junction, the total current splits between branches, but the potential difference remains the same across each branch. Here's something interesting—when resistors connect in parallel, their combined resistance is actually lower than even the smallest resistor in the group!
Exam alert! Understanding the difference between series and parallel circuits is crucial for exams. Remember: in series, current is constant; in parallel, voltage is constant across branches.
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Physics782 views·Updated Jun 3, 2026·4 pagesGCSE AQA Physics Energy and Electricity Notes for Paper 1
Kay <3@n1ghtks
Energy and electricity are fundamental topics that explain how our world works. These concepts help us understand everything from why a ball stops rolling to how electric circuits power our devices. Let's break down these essential physics concepts in a... Show more
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Energy Stores and Transfers
When we talk about energy, we're looking at how it's stored in systems (objects or groups of objects) and how it moves around. Energy is always on the move!
For example, when a rolling ball hits a wall, its kinetic energy (movement energy) doesn't disappear—it transforms into sound energy. Similarly, when a car slows down, friction converts kinetic energy into thermal energy (heat). This follows the principle that energy cannot be created or destroyed, only transferred or transformed.
Power measures how quickly energy is transferred and is calculated as: power = energy transferred ÷ time. It's measured in watts (W), where 1 watt means 1 joule of energy is transferred every second.
Remember this! Energy might be "wasted" when it's dissipated into less useful forms, but we can reduce this waste. For instance, lubricating moving parts reduces friction and minimizes energy lost as heat.
2
of 4Sign up to see the content. It's free!
- Access to all documents
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Energy Resources
Our world relies on a mix of energy sources that fall into two main categories: renewable and non-renewable. Non-renewable sources include fossil fuels (coal, oil, gas) and nuclear fuel, while renewable sources include wind, solar, hydroelectric, tidal, geothermal and biofuels.
The key difference? Renewable sources can be replenished naturally, while non-renewable sources exist in finite amounts. Though non-renewables typically provide high energy output, they won't last forever. Different sectors—transportation, electricity generation, and heating—have different energy requirements.
Fossil fuels dominated during the Industrial Revolution because they were easily accessible and energy-rich. However, their environmental impact includes harmful emissions, landscape damage, and contribution to climate change.
Did you know? The adoption of renewable energy has significantly increased in recent years thanks to technological advancements and growing environmental awareness. You're witnessing this energy revolution happening right now!
3
of 4Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Circuit Fundamentals
Electricity only flows when circuits are complete with no breaks. A source of potential difference (like a battery) provides the electrical "push" needed for charge to flow.
Electrical current is the flow of electrical charge, represented by the symbol I. The relationship between current (I), potential difference (V), and resistance (R) is defined by Ohm's Law: I = V/R. This means that higher resistance leads to lower current when voltage stays the same.
Several factors affect resistance in a circuit. Resistance increases with wire length as electrons must pass through more atoms. For special components like thermistors, resistance decreases with higher temperatures, allowing more current to flow. In Light Dependent Resistors (LDRs), resistance decreases with increased light intensity.
Top tip: Think of electrical circuits like water flowing through pipes. Resistance is like a narrowing in the pipe—the narrower the pipe (higher resistance), the less water (current) can flow through.
4
of 4Sign up to see the content. It's free!
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- Improve your grades
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Electrical Circuits
Diodes are fascinating components that act like one-way gates in circuits. They allow current to flow freely in one direction but block it from flowing the opposite way with very high resistance.
In series circuits, current follows just one path, so the current is the same at every point. When resistors are connected in series, their resistances add up: total resistance = R1 + R2 + R3.
Parallel circuits offer multiple paths for current to travel. At each junction, the total current splits between branches, but the potential difference remains the same across each branch. Here's something interesting—when resistors connect in parallel, their combined resistance is actually lower than even the smallest resistor in the group!
Exam alert! Understanding the difference between series and parallel circuits is crucial for exams. Remember: in series, current is constant; in parallel, voltage is constant across branches.
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Energy Transfers
6Most popular content in Physics
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.
AnnaiOS user