G3 Physics and O-Level Static Electricity Hub
G3 Physics and O-Level Static Electricity hub for charge, electric fields, rubbing, induction, hazards and the electrostatic precipitator.
Learning goals
- state that there are positive and negative charges and that charge is measured in coulombs
- state that unlike charges attract and like charges repel
- Describe an electric field as a region where charge experiences force
- Recall that the field lines of an isolated point charge give the direction of the force on a positive test charge
- Draw the directed electric field of an isolated point charge
- Interpret the electric-field pattern between two isolated point charges
- Draw the electric-field pattern between two isolated point charges
- Explain charging by rubbing as electron transfer
- Describe experiments that charge a conductor by induction
- Describe potential electrostatic-charging hazards
- Describe an electrostatic precipitator and transfer the principle
Static electricity concerns separated electric charges that are not flowing continuously around a circuit. The topic connects charge and electric fields to induction, hazards and useful applications.
Start here
- Charge types, interactions and charging by rubbing
- Conductors and insulators as the bridge to mobile-electron reasoning
- Electric fields and field patterns
- Charging a conductor by induction
- Electrostatic hazards
- Electrostatic precipitator and transfer applications
Use the Static Electricity Explorer after steps 3 and 4 to test field direction and induction sequence.
What you will learn
Work through these ideas in order so that each new explanation builds on the movement and separation of electrons:
- Positive and negative charge, the coulomb, and attraction or repulsion
- Electric-field definition, isolated point-charge fields and the positive-test-charge convention
- Field patterns between two unlike or two like isolated point charges
- Charging by rubbing as electron transfer
- Experimental charging by induction using earthing
- Electrostatic charging as a potential hazard
- Electrostatic precipitator and application to new situations
Conductors, insulators and earthing help you explain the required ideas. Polarisation, contact charging, lightning and photocopiers are useful extra contexts. The application you must be ready to explain fully is the electrostatic precipitator.
Lessons
Charge and induction foundations
Charging by Rubbing
Charge types, interactions and electron transfer by rubbing.
Insulators & Conductors
How electron mobility supports rubbing, earthing and induction reasoning.
Ways to Charge Conductors
The experimental induction sequence and electron flow through Earth.
Electric fields
Electric Fields
Directed patterns for isolated, unlike-pair and like-pair point charges.
Hazards and applications
Electrostatic Hazards
Charge build-up, spark discharge, stated harm and risk controls.
Applications
The electrostatic precipitator and transfer to unfamiliar situations.
Revision
Required definitions and rules
| Idea | Required statement | Exam check |
|---|---|---|
| Electric charge | Positive or negative; measured in coulombs (C) | Like charges repel; unlike charges attract. |
| Electric field | Region in which an electric charge experiences a force | Arrow direction is force on a positive test charge. |
| Charging by rubbing | Electrons transfer between materials | Gain electrons: negative; lose electrons: positive. |
| Charging by induction | Charge a conductor without contact using separation and earthing | Disconnect Earth before removing the charged body. |
| Hazard | Charge build-up may discharge as a spark | Name what the spark can ignite or damage. |
| Precipitator | Charge dust, attract it to plates, collect and remove it | Explain each stage, not merely “dust is attracted”. |
Highest-value misconceptions
- Neutral means equal total positive and negative charge, not an absence of charged particles.
- Protons do not move between solid objects during charging; electrons transfer.
- Field arrows show force on a positive test charge; a negative charge feels force oppositely.
- Field lines never cross. Unlike-charge lines connect from positive to negative; like-charge lines do not connect.
- A nearby charged body without earthing only separates charge temporarily; it does not leave net charge after removal.
- A static hazard needs charge build-up and a damaging discharge, such as a spark near fuel vapour or dust.
- A precipitator works by charging particles and exerting electric force, not by mechanical filtering alone.
Practice
G3 Physics / O-Level practice check
The Static Electricity check below covers charge and electric fields, field patterns and rubbing, and induction, hazards and applications.
- Complete the Static Electricity check to find the Static Electricity idea you should revisit first.
- Use the Static Electricity quiz for rapid retrieval.
- Finish with Static Electricity structured practice for explanations, field patterns and unfamiliar applications.
Continue learning
Continue to Current Electricity, where separated charge becomes continuous charge flow. Return to Forces if field-force reasoning is still insecure.
Course and syllabus information
- Course
- SEC G3 Physics
- Edition
- SEC G3 Physics 2027