This key facts covers Key Facts Summary within Mains Electricity & Safety for GCSE Physics. Revise Mains Electricity & Safety in Electricity for GCSE Physics with 13 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 10 of 17 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 17
Practice
13 questions
Recall
30 flashcards
📋 Key Facts Summary
- UK mains: 230 V AC, 50 Hz
- Live wire: brown — carries alternating voltage
- Neutral wire: blue — returns to supply at ~0 V
- Earth wire: green and yellow — safety wire, normally no current
- Fuse on the live wire (to cut the dangerous wire)
- Choose fuse just above normal operating current
- Double insulation: plastic case, no earth wire needed
- Circuit breaker: can be reset; fuse must be replaced