Essential values (memorise these):
- Voltage: 230 V
- Frequency: 50 Hz (alternates 50 times per second)
- Type: AC (alternating current)
AC vs DC:
- AC (alternating current) — direction reverses constantly; used for mains power
- DC (direct current) — flows in one direction only; batteries provide DC
Why AC for mains? AC voltage can be easily changed using transformers — stepped up for efficient long-distance transmission, stepped down for safe household use.
This deep dive covers UK Mains Supply — Key Facts within Mains Electricity & Safety for GCSE Physics. Revise Mains Electricity & Safety in Electricity for GCSE Physics with 18 exam-style questions and 30 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 16 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Mains Electricity & Safety
What does AC stand for, and how does it differ from DC?
Explain how a fuse protects an electrical circuit from damage.