CIE iGCSE Co-Ordinated Science P4.4 Electrical safety Exam Style Questions Paper 2
Question
The instructions for a household lamp state that the plug must be fitted with a 3A fuse.
What happens if a 13A fuse is fitted by mistake?
(A) The fuse blows too easily.
(B) The lamp lights less brightly.
(C) The wires connecting the lamp to the plug overheat if a fault develops.
(D) Too much voltage is supplied to the lamp.
▶️Answer/Explanation
Ans: C
Question
A heater circuit is protected by a 10A fuse.
How does the fuse protect the circuit?
(A) It cuts off the current when the current in the heater is greater than 10A.
(B) It decreases the current in the heater to 10A when the current is more than 10A.
(C) It increases the current in the heater to 10A when the current is less than 10A.
(D) It maintains a constant temperature in the heater.
▶️Answer/Explanation
Ans: A
Question
What is the function of a fuse in a circuit?
(A) It decreases the resistance of the circuit.
(B) It ensures a constant current in the circuit.
(C) It ensures a constant resistance in the circuit.
(D) It prevents the cables from overheating.
▶️Answer/Explanation
Ans: D
Question
The table shows the usual current in each of four household appliances and the fuse used to
protect each of them. The only fuses available are rated at 3A, 5A or 13A. Which row shows an appliance that has been fitted with the most appropriate of the fuses available?
▶Answer/Explanation
Ans :B