Question 28 (ii)
$B_{1}, B_{2}, a n d B_{3}$ 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.
(ii) What happens to the reading of $A_{1}, A_{2} A_{3}$ and A when the bulb $B_{2}$ gets fused?

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Solution

(ii) $A_{2}$ - Zero
Total resistance = $(\frac{4.5 \times 4.5}{4.5 + 4.5}) = 2.25 Ω$
Therefore, total current = $\frac{4.5}{2.25} = 2 A$
And since bulb 1 and bulb 3 are identical, 1 A of current will flow through each.
$A_{1}$ shows 1 ampere, $A_{2}$ shows zero, $A_{3}$ shows 1 ampere and A shows 2 amperes.

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Question 28 (ii)
$B_{1}, B_{2}, a n d B_{3}$ 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.
(ii) What happens to the reading of $A_{1}, A_{2} A_{3}$ and A when the bulb $B_{2}$ gets fused?

Question 28 (i)
$B_{1}, B_{2}$ and $B_{3}$ 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 glow of the other two bulbs when the bulb $B_{1}$ gets fused?

Q. Question 28 (iii)

B_{1}, B_{2}

and

B_{3}

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.
(iii) How much power is dissipated in the circuit when all the three bulbs glow together?

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Question 28 (ii) B1, 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. (ii) What happens to the reading of A1, A2 A3 and A when the bulb B2 gets fused?

(ii) A2 - Zero Total resistance = (4.5×4.54.5+4.5)=2.25Ω Therefore, total current = 4.52.25=2A And since bulb 1 and bulb 3 are identical, 1 A of current will flow through each. A1 shows 1 ampere, A2 shows zero, A3 shows 1 ampere and A shows 2 amperes.

Question 28 (ii)
$B_{1}, B_{2}, a n d B_{3}$ 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.
(ii) What happens to the reading of $A_{1}, A_{2} A_{3}$ and A when the bulb $B_{2}$ gets fused?