Physics covers the fundamental forces and energy that power everything...
Physics375 views·Updated 7 Aug 2026·3 pagesKey Notes on Electricity - Physics Paper 1
Millie@millie_rains
1 / 3
1
of 3
Electricity Fundamentals
Think of electricity like water flowing through pipes - current is how much charge flows past a point (measured in amps), whilst voltage is the pressure pushing it along (measured in volts). Resistance acts like a narrow pipe that slows everything down (measured in ohms).
The golden rule for current? It's exactly the same everywhere in a series circuit - no electrons get lost along the way! When resistance goes up, current goes down, which is why your phone charger gets warm when it's working hard.
I-V graphs show you how different components behave. Ohmic conductors give you a straight line (boring but reliable), filament lamps curve upward as they heat up, and diodes only let current flow one way - like a one-way street for electrons.
Quick tip: Remember that in series circuits, voltages add up but current stays the same. In parallel circuits, it's the opposite - currents add up but voltage stays the same across each branch.
2
of 3
Energy and Heat
Energy comes in loads of different forms, and here's the brilliant bit - it never disappears, just changes from one type to another. Kinetic energy (movement) uses the formula KE = 0.5 × mass × velocity², whilst potential energy (stored energy) equals mass × gravitational field strength × height.
Specific heat capacity tells you how much energy you need to heat 1kg of something by 1°C. Think of it as how stubborn a material is about changing temperature - water needs loads of energy, which is why the sea takes ages to warm up in summer.
Specific latent heat is the energy needed to change state (like melting ice) without changing temperature. There are two types: fusion (solid to liquid) and vaporisation (liquid to gas). The particles are rearranging themselves, not speeding up.
Remember: Internal energy is the total of all kinetic and potential energy stores in a substance. When you heat something, you're increasing this internal energy.
3
of 3
Pressure, Power and Efficiency
Density measures how tightly packed matter is (mass ÷ volume). For regular objects, just measure and calculate. For irregular shapes, use water displacement - the volume of water pushed out equals the object's volume.
Power is how quickly energy gets transferred or work gets done, measured in watts. It's the difference between a sports car and a tractor - both might do the same job, but one does it much faster.
Efficiency compares useful energy output to total energy input, always less than 100% because some energy always gets wasted as heat. You can improve efficiency with lubricants to reduce friction, or insulation to prevent heat loss through conduction and convection.
Energy conservation law: Energy cannot be created or destroyed, only transferred between different stores like kinetic, gravitational, chemical, electrical, and thermal energy.
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
Most popular content: Ohm's Law
3PhysicsUnderstanding Ohm's Law
Dive into the fundamentals of Ohm's Law, which defines the relationship between voltage, current, and resistance in electrical circuits. This summary covers key concepts, mathematical expressions, applications in circuit analysis, power calculations, and limitations of Ohm's Law. Ideal for students studying electronics and electrical engineering.
122873
PhysicsGCSE Physics Practical Experiments
Explore essential CCEA GCSE Physics practical experiments, including Ohm's Law, Hooke's Law, and the relationship between mass and volume. This summary covers key concepts such as resistance, power, and electromagnetism, providing a clear understanding of experimental setups and results. Ideal for revision and exam preparation.
1175422
PhysicsPhysics paper 1 notes
Here are some notes for aqa physics combined paper 1*This is not all the content you need to know, just the ones I revised for my gcses-The writing highlighted in green is the things that actually came up!*
10811
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3942
PhysicsForces and Motion Overview
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.
109,244872
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96441
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
111,25510
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104621
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,079941
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1011,422477
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
111,33438
P
PhysicsPhysics Quiz - Current, Charge and Power
AQA physics quiz.
111,0302
Most popular content
9
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,7071,402
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,8692,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,9091,061
C
BiologyCell Biology and Cell structure
cell structures
113,3710
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,185125
SociologyMedia Studies: Key Concepts & Theories
Dive into the essential concepts and theories of media studies for AQA A-level Sociology. This comprehensive revision guide covers topics such as media influence, representations, globalization, and sociological perspectives, ensuring you grasp the critical elements needed for your exams. Perfect for students seeking to enhance their understanding of media's role in society.
1222,751514
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,4044
G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3942
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12103,0313,041
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
Physics375 views·Updated 7 Aug 2026·3 pagesKey Notes on Electricity - Physics Paper 1
Millie@millie_rains
Physics covers the fundamental forces and energy that power everything around us, from the electricity in your phone to the heat that warms your home. Understanding these concepts will help you make sense of how the world works and give...
1
of 3
Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Electricity Fundamentals
Think of electricity like water flowing through pipes - current is how much charge flows past a point (measured in amps), whilst voltage is the pressure pushing it along (measured in volts). Resistance acts like a narrow pipe that slows everything down (measured in ohms).
The golden rule for current? It's exactly the same everywhere in a series circuit - no electrons get lost along the way! When resistance goes up, current goes down, which is why your phone charger gets warm when it's working hard.
I-V graphs show you how different components behave. Ohmic conductors give you a straight line (boring but reliable), filament lamps curve upward as they heat up, and diodes only let current flow one way - like a one-way street for electrons.
Quick tip: Remember that in series circuits, voltages add up but current stays the same. In parallel circuits, it's the opposite - currents add up but voltage stays the same across each branch.
2
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Energy and Heat
Energy comes in loads of different forms, and here's the brilliant bit - it never disappears, just changes from one type to another. Kinetic energy (movement) uses the formula KE = 0.5 × mass × velocity², whilst potential energy (stored energy) equals mass × gravitational field strength × height.
Specific heat capacity tells you how much energy you need to heat 1kg of something by 1°C. Think of it as how stubborn a material is about changing temperature - water needs loads of energy, which is why the sea takes ages to warm up in summer.
Specific latent heat is the energy needed to change state (like melting ice) without changing temperature. There are two types: fusion (solid to liquid) and vaporisation (liquid to gas). The particles are rearranging themselves, not speeding up.
Remember: Internal energy is the total of all kinetic and potential energy stores in a substance. When you heat something, you're increasing this internal energy.
3
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Pressure, Power and Efficiency
Density measures how tightly packed matter is (mass ÷ volume). For regular objects, just measure and calculate. For irregular shapes, use water displacement - the volume of water pushed out equals the object's volume.
Power is how quickly energy gets transferred or work gets done, measured in watts. It's the difference between a sports car and a tractor - both might do the same job, but one does it much faster.
Efficiency compares useful energy output to total energy input, always less than 100% because some energy always gets wasted as heat. You can improve efficiency with lubricants to reduce friction, or insulation to prevent heat loss through conduction and convection.
Energy conservation law: Energy cannot be created or destroyed, only transferred between different stores like kinetic, gravitational, chemical, electrical, and thermal energy.
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
Most popular content: Ohm's Law
3PhysicsUnderstanding Ohm's Law
Dive into the fundamentals of Ohm's Law, which defines the relationship between voltage, current, and resistance in electrical circuits. This summary covers key concepts, mathematical expressions, applications in circuit analysis, power calculations, and limitations of Ohm's Law. Ideal for students studying electronics and electrical engineering.
122873
PhysicsGCSE Physics Practical Experiments
Explore essential CCEA GCSE Physics practical experiments, including Ohm's Law, Hooke's Law, and the relationship between mass and volume. This summary covers key concepts such as resistance, power, and electromagnetism, providing a clear understanding of experimental setups and results. Ideal for revision and exam preparation.
1175422
PhysicsPhysics paper 1 notes
Here are some notes for aqa physics combined paper 1*This is not all the content you need to know, just the ones I revised for my gcses-The writing highlighted in green is the things that actually came up!*
10811
Most popular content in Physics
9G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3942
PhysicsForces and Motion Overview
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.
109,244872
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
96441
PhysicsPhysics paper 2 notes
physics aqa gcse paper 2 combined higher notes
111,25510
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104621
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,079941
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1011,422477
Physicsphysics paper 2 foundation notes
aqa combined science physics paper 2 foundation notes
111,33438
P
PhysicsPhysics Quiz - Current, Charge and Power
AQA physics quiz.
111,0302
Most popular content
9SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,7071,402
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,8692,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,9091,061
C
BiologyCell Biology and Cell structure
cell structures
113,3710
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,185125
SociologyMedia Studies: Key Concepts & Theories
Dive into the essential concepts and theories of media studies for AQA A-level Sociology. This comprehensive revision guide covers topics such as media influence, representations, globalization, and sociological perspectives, ensuring you grasp the critical elements needed for your exams. Perfect for students seeking to enhance their understanding of media's role in society.
1222,751514
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,4044
G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3942
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12103,0313,041
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