What you'll learn
Mains electricity and safety.
Key ideas
- Mains is a.c. (~230 V); wires: live (brown), neutral (blue), earth (green/yellow).
- Fuses and the earth wire for safety; power (P = VI); energy (E = Pt).
Exam tips
- Learn the wire colours.
- Explain how a fuse protects a circuit.
Common mistakes
- Mixing up wire colours.
- Confusing a.c. and d.c.