Question

B₁, B₂, B₃ are three identical bulbs connected as shown in figure. Ammeters A₁, A₂, A₃ are connected as shown. When all the bulbs glow, the current of 3A is recorded by ammeter A.
(i) What happens to the glow of the other two bulbs when 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?

Answer 1

(i) When bulb B₁ gets fused, the currents in B₂ and .B₃ remain same I₂ = I₃ = 1A, so their glow remains unaffected.
(ii) When bulb B₂ gets fused, the current in .B₂ becomes zero and currents in B₁ and B₃ remains 1 A.