Static Electricity
Rubbing transfers electrons and builds up static charge.
About this topic
Static electricity is the build-up of charge on insulating surfaces, usually by friction transferring electrons: rubbing a balloon on hair makes the balloon negative and hair positive, so they attract. Charged objects attract neutral ones by polarisation.
In polarisation, the charges inside a neutral object shift slightly, so the side nearest the charged balloon gains the opposite charge and is pulled closer; this is why the balloon sticks to a wall. Discharge produces sparks, from small shocks to lightning, when the electric field in air becomes strong enough to ionise it.
Static is useful in photocopying, spray painting and dust filters, but dangerous around fuel and electronics, so earthing straps are used to drain charge safely. Aircraft and tankers are earthed during refuelling for this reason.
Static builds up more easily in dry weather, since moist air lets charge leak away. A common misconception is that friction creates charge; it only moves electrons from one surface to the other.
Key ideas
- Lightning is a huge discharge
- Insulators hold charge
- Grounding drains it
Quick check
Use cases: where Static Electricity helps
- Homework: review the key idea behind Static Electricity before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Static Electricity without notes.
- Visual learning: play with the interactive lab to see how Static Electricity changes when you adjust its inputs.
- Teaching a friend: explain Static Electricity in your own words, then compare your version with the key ideas.
The same laws describe car crashes, sports, satellites and everyday machines.
Frequently asked questions
What is Static Electricity?
Rubbing transfers electrons and builds up static charge.
What will I learn in Static Electricity?
Lightning is a huge discharge. Insulators hold charge. Grounding drains it.
Is Static Electricity part of Physics?
Yes. It is one of 150 Physics topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Static Electricity lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Static Electricity?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.