Two sets A and B of four bulbs each, are glowing in two separate rooms. When one Of the bulbs in set is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the remaining ones continue to glow. Explain the difference.

Two sets A and B of four bulbs each, are glowing in two separate rooms

1.	Two sets A and B of four bulbs each, are glowing in two separate rooms. When one Of the bulbs in set is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the remaining ones continue to glow. Explain the difference.
Answer» In set A, the bulbs are joined in series so there is only one path of current for each bulb. But in set B, the bulbs are joined in parallel so there is separate path of current for each bulb.