Electrical Power & Mains 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. Which equation links electrical power, current and voltage?
- A. E = QV
- B. P = IV
- C. V = IR
- D. Q = It
2. What type of current does mains electricity supply?
- A. Direct current
- B. Alternating current
- C. Static current
- D. No current
3. What is the main function of a fuse?
- A. To increase the current in a circuit
- B. To melt and break the circuit if current exceeds a safe level
- C. To store electrical energy
- D. To convert a.c. to d.c.
4. An appliance operates at 460 W and 230 V. What current does it draw?
- A. 1 A
- B. 2 A
- C. 10 A
- D. 20 A
5. How does a circuit breaker differ from a fuse in its response to overcurrent?
- A. A circuit breaker melts, a fuse trips and resets
- B. A circuit breaker trips and can be reset, a fuse melts and must be replaced
- C. They work identically
- D. A circuit breaker only works on d.c. circuits