Experts...please answer

27. Bl, B2 and B3 are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.

 
(i) What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?

Dear student,As B2 gets fused then no current will flow in that arm hence reading of A2 will become zero.Now after B2 get fused current in the A1 and A3 will increase.The current in A will remain same.Regards

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(i)its a circuit where b1,b2 & b3 are connected in parallel. hence,if b2 stops glowing other bulbs will continue to glow(as each bulb has its own switch).
given: 3A is recorded by A when all bulbs are glowing.
so if 1bulb (b2) stops glowing :
a1 will show 1A,
a2 will show 0 - no current ,
a3 will show 1A and
a will show 2A(a1+a3).
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A1 and A3 show reading of 1 Ampere

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