Question 3 — In Fig. 3.17, if the filament - Questions at the end of the chapter - Chapter 3 Class 7 - Electricity: Circuits and their Components

Last updated at August 17, 2026 by

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
Effect of Broken Filament Filament breaks Gap created in wire Current stops No path for electricity Independent path intact Only broken lamp affected Yes, other lamp still glows
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