Domestic Electricity Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What is the frequency of UK mains electricity?
- A. 50 Hz
- B. 60 Hz
- C. 100 Hz
- D. 230 Hz
2. Which wire in a domestic plug carries the electrical current back to the supply?
- A. The live wire
- B. The neutral wire
- C. The earth wire
- D. The fuse wire
3. An appliance is rated at 3000 W and operates at 230 V. What is the minimum fuse rating that should be used for this appliance?
- A. 10 A
- B. 13 A
- C. 15 A
- D. 20 A
4. Explain why both the earth wire and fuse together provide better protection than either one alone.
- A. The earth wire stops current flowing and the fuse prevents overheating
- B. The fuse cuts off the circuit if current becomes too high, whilst the earth wire provides a safe path for fault current to prevent electrocution
- C. The earth wire melts before the fuse breaks
- D. Together they increase the voltage of the appliance
5. Why does a frayed or damaged cable pose a particular danger in damp conditions?
- A. Water makes the plastic insulation softer and more flexible
- B. Damp conditions increase the conductivity of water, allowing current to flow through the user's body rather than through the intended circuit path, causing electrocution
- C. Water reduces the frequency of the mains electricity
- D. Damaged cables always fail immediately regardless of conditions