Static electricity is charge that builds up on insulating materials when they are rubbed together, as electrons transfer between surfaces. Free notes.
Updated 20 Mar 2026 · Revise Right Team
Producing Static Electricity is part of Static electricity (physics only) in GCSE AQA Higher Physics.
3 min
Reading time
24
Lessons in this topic
GCSE AQA Higher
Pathway
Reviewed by Revise Right
Content review
What this lesson covers
Static electricity is charge that builds up on insulating materials when they are rubbed together, as electrons transfer between surfaces. Free notes.
Describe how static electricity is produced by rubbing insulating materials together
Explain the transfer of electrons between objects during static electricity production
Describe evidence that charged objects exert forces on each other without contact
Apply knowledge of electron transfer to explain attraction and repulsion between charged objects
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Use this lesson to stay inside Static electricity (physics only) while connecting the detail back to the wider Electricity topic.
Electricity
Static electricity (physics only)
GCSE AQA Higher Physics
Revision notes
Read the core explanations from Producing Static Electricity before testing yourself from memory.
1. The Mystery of Static Electricity
Ever rubbed a balloon on your hair and watched it stick to the wall? Or got a shock touching a door handle after walking across carpet? You've experienced static electricity - but what's actually happening at the atomic level?
Static electricity occurs when certain insulating materials are rubbed against each other. Unlike the moving electricity in circuits, static electricity stays put on the surface of objects. The key word here is 'insulating' - materials like plastic, rubber, and glass can build up static charge because electrons can't flow through them easily.
2. What Really Happens When You Rub Materials Together
When you rub two insulating materials together, you're not creating electricity - you're moving it around. All atoms contain equal numbers of positive protons and negative electrons, making them electrically neutral. But electrons in the outer shells of atoms can sometimes be transferred from one material to another.
Here's the crucial point: the material that gains electrons becomes negatively charged, while the material that loses electrons becomes positively charged. The total charge is always conserved - if one object gains 1000 electrons, the other loses exactly 1000 electrons.
Worked example: Charging a Plastic Rod with a Cloth
Explain what happens when you rub a plastic rod with a dry cloth, including which charges are produced.
Both plastic rod and cloth are electrically neutral — Equal numbers of protons and electrons in each material
Friction causes electrons to transfer from cloth to plastic rod — The plastic has a stronger attraction for electrons than the cloth
Plastic rod: negatively charged (gained electrons)
Cloth: positively charged (lost electrons) — The rod has excess electrons, the cloth has a deficit of electrons
Total charge = 0 (same as at start) — No charge is created or destroyed, only transferred
Answer: The plastic rod becomes negatively charged and the cloth becomes positively charged due to electron transfer from cloth to rod.
3. Forces Between Charged Objects
Once objects become charged, something remarkable happens - they can push or pull on each other without even touching. This is evidence that charged objects exert forces on one another when not in contact.
The rule is simple but crucial: like charges repel, opposite charges attract. Two negatively charged objects push each other away. Two positively charged objects also repel. But a positive and negative object pull towards each other.
Positive + Positive = Repulsion (push apart)
Negative + Negative = Repulsion (push apart)
Positive + Negative = Attraction (pull together)
You can demonstrate this with two balloons. Rub both on your hair - they'll both become negatively charged and push each other away. But if you rub one balloon on your hair and hold it near the wall, it sticks because it induces opposite charges on the wall surface.
4. Sparking and Discharge
Static electricity doesn't stay static forever. When enough charge builds up, or when a charged object gets close to a conductor, you get sparking. This is the dramatic discharge of static electricity as electrons jump through the air.
The spark you see is actually the air molecules being ionised as electrons force their way through. Air is normally an insulator, but with enough voltage, electrons can punch through it. This is why you get shocked touching door handles - your body has built up charge walking on carpet, and the metal handle provides a path for discharge.
Worked example: Why Lightning Happens
Explain how static electricity in clouds leads to lightning strikes.
Ice particles rub together in storm clouds — Friction transfers electrons, creating regions of positive and negative charge
Bottom of cloud becomes negatively charged
Top of cloud becomes positively charged — Millions of collisions create huge charge differences
Voltage between cloud and ground reaches millions of volts — The electric field becomes strong enough to ionise air
Electrons jump from cloud to ground as lightning — Air becomes conductive and charge flows rapidly
Answer: Lightning is a massive static electricity discharge when charge separation in clouds creates voltages high enough to make air conductive.
6. Exam Technique and Common Mistakes
Static electricity questions often test your understanding of electron movement and charge conservation. Examiners love to ask about what happens to both objects when they're rubbed together - remember, if one gains electrons, the other must lose the same number.
Common exam mistake: Students often say 'positive charges move' or 'the object gains positive charge'. Remember - in static electricity, only electrons move. An object becomes positively charged by losing electrons, not by gaining positive charges.
Sources and content standards
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-20.
Static electricity is electric charge that builds up on insulating materials when they are rubbed together, caused by the transfer of electrons between surfaces. Unlike the moving electricity in circuits, it stays put on the surface of objects.
How does lightning form?
Lightning forms when ice particles rub together in storm clouds, transferring electrons so the bottom of the cloud becomes negatively charged. The voltage between cloud and ground reaches millions of volts, the electric field ionises the air, and electrons jump from cloud to ground.
How is static electricity produced?
Static electricity is produced when certain insulating materials are rubbed together, transferring electrons from one surface to the other. The material that gains electrons becomes negatively charged, and the material that loses electrons becomes positively charged.
Are atoms charged before rubbing?
Atoms are electrically neutral before rubbing because they contain equal numbers of positive protons and negative electrons. Rubbing two insulating materials together moves electrons in the outer shells from one material to the other.
How does an object become positively charged?
An object becomes positively charged by losing electrons, not by gaining positive charges. In static electricity only electrons move; the cloth rubbed on a plastic rod loses electrons and is left positively charged.
Why does a plastic rod become negatively charged when rubbed with a cloth?
A plastic rod becomes negatively charged because friction transfers electrons from the cloth to the rod, as the plastic has a stronger attraction for electrons. The cloth loses electrons and becomes positively charged, and the total charge stays zero.
Do like charges attract or repel?
Like charges repel and opposite charges attract. Two negatively charged objects push each other away, as do two positively charged objects, but a positive and a negative object pull towards each other, even without touching.
Do positive charges move in static electricity?
In static electricity only electrons move; positive charges do not. An object becomes positively charged by losing electrons, not by gaining positive charges, and an object becomes negatively charged by gaining electrons.
Why can only insulators be charged by rubbing?
Insulating materials like plastic, rubber and glass can build up static charge because electrons cannot flow through them easily. The transferred electrons stay on the surface instead of flowing away.
What is electron transfer in static electricity?
Electron transfer is the movement of negatively charged electrons from one material to another during rubbing. The material that gains electrons becomes negatively charged, and the material that loses electrons becomes positively charged.
Why does a balloon stick to a wall?
A balloon rubbed on hair sticks to a wall because it is charged and induces opposite charges on the wall surface. Opposite charges attract, so the balloon is pulled towards the wall.
Why do two balloons rubbed on hair push apart?
Two balloons rubbed on hair both become negatively charged, so they push each other away. Like charges repel and opposite charges attract, which is evidence that charged objects exert forces without contact.
Is charge conserved when objects are rubbed together?
Charge is always conserved when objects are rubbed together: if one object gains 1000 electrons, the other loses exactly 1000 electrons. No charge is created or destroyed, so the total charge stays the same as at the start.
What is a spark in static electricity?
A spark is the dramatic discharge of static electricity as electrons jump through the air. Air is normally an insulator, but with enough voltage electrons force their way through, ionising the air molecules.
What charge is at the bottom of a storm cloud?
The bottom of a storm cloud becomes negatively charged and the top becomes positively charged. Ice particles rub together, and friction transfers electrons, creating regions of positive and negative charge.