Electricity · 0 question types
Past paper frequency (2018 to 2024)
This topic accounts for approximately 6% of your exam marks.
Charging by friction, electric fields and uses/dangers of static electricity tested as shorter questions.
| Equipment | Purpose |
|---|---|
| Polythene rod (the reference rod) | Charged once, suspended from a cradle, used to test every other rod against |
| Test rods (acetate, perspex, glass, ebonite, dry wood) | Each one rubbed and brought near the suspended reference rod |
| Cloth (one per rod) | Used to rub the rod and so charge it |
| Insulating cradle of nylon string | Hangs the polythene rod horizontally and lets it rotate freely without leaking charge away |
| Wooden retort stand | Holds the cradle clear of the bench |