Question
An electric heater is plugged into the mains supply using a fused plug.
The current in the heater is 10 A.
The cable attached to the heater is rated at 15 A.
The fuses available are rated at 1 A, 3 A, 5 A and 13 A. Which fuse should be used?
A 1 A
B 3 A
C 5 A
D 13 A
Answer/Explanation
Ans: D
Question
After some building work in a house, a bare (uninsulated) live wire is left protruding from a wall.
What is the greatest hazard?
A. a fire
B. a fuse blows
C. an electric shock
D. no current flows
Answer/Explanation
Ans: C
Question
In this circuit, a component at X automatically protects the wiring from overheating if there is a
fault.
Which row indicates components that are suitable?
Answer/Explanation
Ans: B
Question
Which circuit contains a fuse?
Answer/Explanation
Ans: C
Question
The circuit shows a battery and four lamps. All the lamps are lit.
One lamp fails and all the lamps go out.
Which lamp failed?
Answer/Explanation
Ans: A