1.

(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.(ii) Why do we prefer arrangements of Set B for house circuiting?

Answer»

(i) In set A, bulbs are in series so if one gets fused, others are also affected. In set B, bulbs are in parallel so if one goes off, others continue to glow.

(ii) For house circuiting, we use the set B arrangement i.e., all the appliances are connected in parallel because in this arrangement each appliance operates at the same voltage and works independently without being affected whether the other appliance is switched on or off. 



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