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Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

1. 4:9
2. 9:4
3. 1:2
4. 2:1

Correct answer: 9:4

Solution

When all bulbs are glowing, the total resistance is lower due to parallel connections, leading to higher power consumption. In the second case, fewer bulbs are glowing, increasing the total resistance and reducing power consumption. The ratio of power consumption is 9:4.

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