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Q3 (Medium): In Fig. 3.17, if the filament of one of the lamps is broken, will the other glow? Justify your answer.
Answer:
We have studied that
broken filament
stops the
flow of current
completely. This is why the other lamp
will still glow
(Fig. 3.17 is a parallel circuit — each lamp has its own independent path).
- Fig. 3.17 is a PARALLEL circuit — lamps are connected across the same two points
- Broken filament creates gap in circuit
- Lamp 2's path remains complete and unaffected
- Yes, the other lamp WILL glow — it has its own independent circuit path
Q5 (Medium): Draw a circuit diagram for a simple torch using symbols for electric components.
Answer:
We have studied that
circuit diagrams
use
standard symbols
for electrical components. This is why we draw torch circuit with proper symbols.
- Electric cell shown with long and short lines
- Switch shown with gap or connection
- Lamp shown with circle and cross
- Wires shown as straight connecting lines
Q8 (Medium): In Fig. 3.20, in which case(s) the lamp will not glow when the switch is closed?
Answer:
We have studied that
complete circuit
is needed for
current flow
. This is why lamp won't glow in cases with circuit breaks.
- Broken wire prevents current flow
- Wrong cell connections stop current flow
- Damaged components create circuit gaps
- All connections must be properly made
