NCERT Exemplar XXVIII — task. Science CBSE, Class 10.

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$B_1$ , $B_2$ 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?

(ii) What happens to the reading of $A_1$ , $A_2$ and $A_3$ and $A$ when the bulb $B_2$ gets fused?

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

Circuit diagram

(i) When the bulb

$B_1$ gets fused, the glow of the other two bulbs

$B_2$ and

$B_3$ .

(ii) Total resistance is given by

$\begin{array}{l} \frac{1}{R^{'}} = \frac{i}{i} \\ R^{'} = \frac{i}{i} \end{array}$

From Ohm's law,

$i = i i$ we get the value of resistance as

$Ω$ .

When the bulb

$B_2$ gets fused, then the total resistance is

$\begin{array}{l} \frac{1}{R} = \frac{i}{i} \\ R = \frac{i}{i} \end{array}$

The current is

$\begin{array}{l} i = \frac{i}{i} \\ = i A \end{array}$

Reading of

$A_1$

$=$

$A$

Reading of

$A_2$

$=$

$A$

Reading of

$A_3$

$=$

$A$

(iii) The formula for power dissipation in the circuit is . On substituting the known values, we get .

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87. NCERT Exemplar XXVIII

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