How Static Charge Builds Up: Friction and Electron Transfer
Part of Static Electricity · GCSE GCSE Physics revision
This deep dive covers How Static Charge Builds Up: Friction and Electron Transfer within Static Electricity for GCSE Physics. Revise Static Electricity in Electricity for GCSE Physics with 15 exam-style questions and 12 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 15 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 15
Practice
15 questions
Recall
12 flashcards
🔬 How Static Charge Builds Up: Friction and Electron Transfer
All matter is made of atoms. Atoms contain protons (positive) in the nucleus and electrons (negative) orbiting outside. Normally, an object has equal numbers of protons and electrons, so it is electrically neutral.
When two insulating materials are rubbed together, electrons are transferred from one material to the other:
- The material that gains electrons becomes negatively charged (it now has more electrons than protons)
- The material that loses electrons becomes positively charged (it now has fewer electrons than protons)
- Protons do not move — they are locked inside the nucleus. Only electrons transfer.
- The total charge is conserved: the charge gained by one object exactly equals the charge lost by the other
Example: A plastic rod rubbed with a cloth — electrons transfer from the cloth to the rod. The rod becomes negatively charged; the cloth becomes positively charged.
This only works with insulators (like plastic, glass, rubber). In conductors (like metals), electrons flow freely through the material and to earth — charge cannot build up. This is why you do not build up static charge by touching a metal doorknob directly.