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प्रश्न
Two sets A and B of four bulbs each are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. Explain the difference in the two sets.
उत्तर १
In set A, the bulbs are connected in series. Thus, when the fuse of one bulb blows off, the circuit gets broken and current does not flow through the other bulbs also. In set B, the bulbs are connected in parallel. Thus, each bulb gets connected to its voltage rating (= 220 V) and even when the fuse of one bulb blows off, others remain unaffected and continue to glow.
उत्तर २
If the first bulb in set A were to blow a fuse and cut off power to the other three, none of the lights would work. All four bulbs in set B connect in a parallel. Bulbs keep glowing even after a single bulb blows.
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