(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?

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Solution

(i) In set A: Bulbs are in series, so if one gets fused others are also affected. In series potential difference is variable, electric current is constant.
In set B: Bulbs are in parallel, so if one goes off others continue to glow. Here potential difference is constant, current varies inversely as resistance.
(ii) We prefer set B for household circuits as they are in parallel. Potential difference is constant ( $220 V$ ) which is supplied by electricity department and the electric current varies according to the value of resistors (or) appliances used. If one circuit goes off, others continue to function.

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