1. B1 , B2 and B3 are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.
(i) What happens to the glow of the other two bulbs when the bulb B1 gets fused?
(ii) What happens to the reading of A1 , A2 , A3 and A when the bulb B2 gets fused?
(iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Question

1.	B1 , B2 and B3 are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.
(i)	What happens to the glow of the other two bulbs when the bulb B1 gets fused?
(ii)	What happens to the reading of A1 , A2 , A3 and A when the bulb B2 gets fused?
(iii)	How much power is dissipated in the circuit when all the three bulbs glow together?

MyClass24 · Accepted Answer

Potential difference does not get divided in parallel Hence glowing of other bulbs will not get affected when bulb one is fused.


Ammeter A shows a reading of This means each of the Al. A2, and A3 show IA reading.


R= V= 5 V = 1.5Ω

I 3A Now P= I2R
= (3A)2 x 1.5 Ω
= 13.5 W