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Q6 (Difficult): In Fig. 3.18: (i) If S2 is in 'ON' position, S1 is in 'OFF' position, which lamp(s) will glow? (ii) If S2 is in 'OFF' position, S1 is in 'ON' position, which lamp(s) will glow? (iii) If S1 and S2 both are in 'ON' position, which lamp(s) will glow? (iv) If both S1 and S2 are in 'OFF' position, which lamp(s) will glow?
Answer:
We have studied that
switches
control the
flow of current
in different circuit paths. This is why different switch combinations affect different lamps.
- Each switch controls specific circuit branch
- ON switch allows current to flow
- OFF switch creates gap in circuit
- Multiple paths can work independently
Conclusion: Only lamps in complete circuit paths will glow.
Q7 (Difficult): Vidyut has made the circuit as shown in Fig. 3.19. Even after closing the circuit, the lamp does not glow. What can be the possible reasons? List as many possible reasons as you can. What will you do to find out why the lamp did not glow?
Answer:
We have studied that
complete circuit
with
working components
is needed for
current flow
. This is why multiple factors can prevent lamp from glowing.
- Cell may be discharged or wrongly connected
- Lamp filament may be broken or fused
- Wire connections may be loose or broken
- Switch may be faulty or damaged
Conclusion: Check each component systematically to find the problem.
