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Lucía
25/11/2025
Physics
Electricity revision notes GCSE
139
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25 Nov 2025
•
Comprehensive GCSE Electricity Revision Notes
Lucía
@luttior
1 / 7
Circuit Components and Symbols
Electrical circuits contain various components that each serve specific functions. A resistor limits the current flowing through a circuit, while a variable resistor allows you to adjust that current as needed.
The cell is the power source that pushes electrons around the circuit. To measure what's happening in your circuit, you'll use an ammeter to measure current (in amps) and a voltmeter to measure voltage.
Some components respond to environmental conditions. The LDR (Light Dependent Resistor) changes its resistance based on light intensity - perfect for creating circuits that respond to darkness or brightness.
Quick Tip: Think of a circuit like a water pipe system - the cell is the pump pushing water (electrons), resistors are narrow sections slowing the flow, and meters are like gauges telling you how much water is flowing and how hard it's being pushed!
More Circuit Components
A switch controls whether current can flow by creating an open (off) or closed (on) circuit. When you want to see your circuit in action, an LED (Light Emitting Diode) provides visible light when current passes through it in the correct direction.
The thermistor is similar to an LDR but responds to temperature changes instead of light. For safety, circuits often include a fuse designed to melt and break the circuit if too much current flows, preventing damage.
A diode acts like a one-way valve, allowing current to flow in only one direction. And remember, a battery is actually multiple cells combined together to provide more power.
Remember: Circuit diagrams use standardized symbols for these components, making it easier for anyone to understand how the circuit is constructed, regardless of language barriers.
How Current Works
Electricity is fascinating because electrons are always present in wires, but they only create current when pushed by a power source. Electric current is simply the flow of electrons (or charge) around a circuit.
When you turn on a circuit, the battery provides the "push" that moves electrons through the wires. These negatively charged electrons pass through components like bulbs, causing them to light up as energy transfers.
Resistance is what happens when electrons can't flow freely. Imagine a narrow section in a pipe - water flow slows down and pressure builds up. Similarly, when electrons encounter resistance, their flow is restricted, and energy converts to heat.
Visualize it: In a wire with no resistance, electrons flow freely like people walking through a wide hallway. With resistance, it's like squeezing through a narrow doorway - fewer electrons can pass at once, creating "electron traffic jams"!
Resistance and Diodes
Resistance occurs when the flow of charge slows down. Think of it as a bottleneck in the circuit - electrons pile up trying to squeeze through. This restricted flow generates heat, which is why resistors warm up during use.
There are two main types of resistors: fixed resistors maintain the same resistance value at all times, while variable resistors allow you to change the resistance whenever needed. Volume controls and dimming switches use variable resistors to adjust current flow.
A diode is a special component that acts like a one-way gate for electricity. When current attempts to flow in the allowed direction, the diode permits passage. However, when current tries to flow backwards, the diode blocks it completely.
Real-world application: Variable resistors are in devices you use every day! When you turn a volume knob or dim your lights, you're adjusting a variable resistor to control how much current flows through the circuit.
Charge Calculations and Practical Work
The relationship between charge, current and time is given by the equation: Charge (C) = Current (A) × Time (s). This lets you calculate how much charge flows through a circuit over a specific time period.
For example, if a circuit has a current of 0.25A flowing for 60 seconds, the charge would be 0.25 × 60 = 15C. For longer times, remember to convert to seconds first .
Learning how to investigate resistance is an important practical skill. You'll need equipment including a battery, ammeter (measures current), voltmeter (measures potential difference), and the wire or component being tested.
Exam tip: Questions involving charge calculations appear frequently in tests! Remember that charge (Q) is measured in coulombs (C), current (I) in amperes (A), and time (t) in seconds (s). Always convert minutes or hours to seconds first.
Investigating Resistance
To calculate resistance, we use the equation: Resistance (Ω) = Potential Difference (V) ÷ Current (A). When investigating how wire length affects resistance, you can set up a practical with a wire attached to a meter ruler.
The wire connects to the circuit using crocodile clips, and by moving these clips further apart, you increase the length of wire in the circuit. Measurements show that resistance is directly proportional to length – double the length, double the resistance.
However, you might notice a small resistance reading even when the wire length should be zero. This is called a zero error – a systematic error that occurs when an instrument shows a reading when it should be zero. To account for this, subtract the zero error from all your measurements.
Practical tip: When conducting resistance experiments, use a low potential difference to prevent heating of the wire. Heat increases resistance and can affect your results, so only turn on the current when taking readings, then turn it off between measurements.
Sources of Error and Variable Resistors
Several factors can cause zero errors in resistance experiments. The crocodile clip might not be positioned exactly at zero on your ruler, or there could be resistance at the contact point between the clip and wire. Even heating effects can introduce errors.
To minimize heating effects, use a low potential difference to keep current low. Only turn on the current when taking readings and turn it off between measurements. This prevents the wire from heating up and changing its resistance properties.
A variable resistor works by changing the length of wire that current must flow through. It typically contains a long piece of wire and a movable contact. By adjusting the slider, you change how much of the resistor is included in the circuit, thereby controlling the potential difference across components like lamps.
Pro tip: In your lab book, always note down potential sources of error and how you tried to minimize them. This shows scientific thinking and can earn you extra marks in assessments!
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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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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
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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
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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
Comprehensive GCSE Electricity Revision Notes
Lucía
@luttior
Electricity is all about how electrons move through circuits to create current. Understanding basic circuit components and their functions is key to grasping how electrical systems work in our everyday devices. Let's explore the fundamental concepts of electrical circuits and... Show more
Circuit Components and Symbols
Electrical circuits contain various components that each serve specific functions. A resistor limits the current flowing through a circuit, while a variable resistor allows you to adjust that current as needed.
The cell is the power source that pushes electrons around the circuit. To measure what's happening in your circuit, you'll use an ammeter to measure current (in amps) and a voltmeter to measure voltage.
Some components respond to environmental conditions. The LDR (Light Dependent Resistor) changes its resistance based on light intensity - perfect for creating circuits that respond to darkness or brightness.
Quick Tip: Think of a circuit like a water pipe system - the cell is the pump pushing water (electrons), resistors are narrow sections slowing the flow, and meters are like gauges telling you how much water is flowing and how hard it's being pushed!
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More Circuit Components
A switch controls whether current can flow by creating an open (off) or closed (on) circuit. When you want to see your circuit in action, an LED (Light Emitting Diode) provides visible light when current passes through it in the correct direction.
The thermistor is similar to an LDR but responds to temperature changes instead of light. For safety, circuits often include a fuse designed to melt and break the circuit if too much current flows, preventing damage.
A diode acts like a one-way valve, allowing current to flow in only one direction. And remember, a battery is actually multiple cells combined together to provide more power.
Remember: Circuit diagrams use standardized symbols for these components, making it easier for anyone to understand how the circuit is constructed, regardless of language barriers.
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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
How Current Works
Electricity is fascinating because electrons are always present in wires, but they only create current when pushed by a power source. Electric current is simply the flow of electrons (or charge) around a circuit.
When you turn on a circuit, the battery provides the "push" that moves electrons through the wires. These negatively charged electrons pass through components like bulbs, causing them to light up as energy transfers.
Resistance is what happens when electrons can't flow freely. Imagine a narrow section in a pipe - water flow slows down and pressure builds up. Similarly, when electrons encounter resistance, their flow is restricted, and energy converts to heat.
Visualize it: In a wire with no resistance, electrons flow freely like people walking through a wide hallway. With resistance, it's like squeezing through a narrow doorway - fewer electrons can pass at once, creating "electron traffic jams"!
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Resistance and Diodes
Resistance occurs when the flow of charge slows down. Think of it as a bottleneck in the circuit - electrons pile up trying to squeeze through. This restricted flow generates heat, which is why resistors warm up during use.
There are two main types of resistors: fixed resistors maintain the same resistance value at all times, while variable resistors allow you to change the resistance whenever needed. Volume controls and dimming switches use variable resistors to adjust current flow.
A diode is a special component that acts like a one-way gate for electricity. When current attempts to flow in the allowed direction, the diode permits passage. However, when current tries to flow backwards, the diode blocks it completely.
Real-world application: Variable resistors are in devices you use every day! When you turn a volume knob or dim your lights, you're adjusting a variable resistor to control how much current flows through the circuit.
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Improve your grades
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Charge Calculations and Practical Work
The relationship between charge, current and time is given by the equation: Charge (C) = Current (A) × Time (s). This lets you calculate how much charge flows through a circuit over a specific time period.
For example, if a circuit has a current of 0.25A flowing for 60 seconds, the charge would be 0.25 × 60 = 15C. For longer times, remember to convert to seconds first .
Learning how to investigate resistance is an important practical skill. You'll need equipment including a battery, ammeter (measures current), voltmeter (measures potential difference), and the wire or component being tested.
Exam tip: Questions involving charge calculations appear frequently in tests! Remember that charge (Q) is measured in coulombs (C), current (I) in amperes (A), and time (t) in seconds (s). Always convert minutes or hours to seconds first.
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Investigating Resistance
To calculate resistance, we use the equation: Resistance (Ω) = Potential Difference (V) ÷ Current (A). When investigating how wire length affects resistance, you can set up a practical with a wire attached to a meter ruler.
The wire connects to the circuit using crocodile clips, and by moving these clips further apart, you increase the length of wire in the circuit. Measurements show that resistance is directly proportional to length – double the length, double the resistance.
However, you might notice a small resistance reading even when the wire length should be zero. This is called a zero error – a systematic error that occurs when an instrument shows a reading when it should be zero. To account for this, subtract the zero error from all your measurements.
Practical tip: When conducting resistance experiments, use a low potential difference to prevent heating of the wire. Heat increases resistance and can affect your results, so only turn on the current when taking readings, then turn it off between measurements.
Sign up to see the contentIt's free!
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Improve your grades
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Sources of Error and Variable Resistors
Several factors can cause zero errors in resistance experiments. The crocodile clip might not be positioned exactly at zero on your ruler, or there could be resistance at the contact point between the clip and wire. Even heating effects can introduce errors.
To minimize heating effects, use a low potential difference to keep current low. Only turn on the current when taking readings and turn it off between measurements. This prevents the wire from heating up and changing its resistance properties.
A variable resistor works by changing the length of wire that current must flow through. It typically contains a long piece of wire and a movable contact. By adjusting the slider, you change how much of the resistor is included in the circuit, thereby controlling the potential difference across components like lamps.
Pro tip: In your lab book, always note down potential sources of error and how you tried to minimize them. This shows scientific thinking and can earn you extra marks in assessments!
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?
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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