Question

(a) Will the bulb glow in the circuit shown in Fig.? Explain. If not, what can be done to light the bulb?



(b) What happens when a bulb gets fused ?
[5 MARKS]

Answer 1

Part (a) : 3 Marks
Part (b): 2 Marks

(a) No, the bulb will not glow in this circuit because the switch is open and the circuit is incomplete.
Whenever we have an open circuit no current flows through it.
So, to light the bulb we can complete the circuit by putting any conductor connecting the two terminals.
We can use a metallic wire to close the open circuit. When we put a metallic wire the bulb will light up.

(b) When a bulb gets fused, its filament is broken that breaks the circuit and the flow of current stops.
The filament is made up of wire with high melting point like tungsten.
A filament is part of the light bulb that produces light.