${\mathrm{B}}_1$, ${\mathrm{B}}_2$ and ${\mathrm{B}}_3$ are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of $3 \mathrm{A}$ is recorded by the ammeter A. What happens to the glow of the other two bulbs when the bulb ${\mathrm{B}}_1$ gets fused?

${\mathrm{B}}_1$, ${\mathrm{B}}_2$ and ${\mathrm{B}}_3$ are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of $3 \mathrm{A}$ is recorded by the ammeter A.  What happens to the reading of ${\mathrm{A}}_1, {\mathrm{A}}_2, {\mathrm{A}}_3$ and $\mathrm{A}$ when the bulb ${\mathrm{B}}_2$ gets fused?

${\mathrm{B}}_1$, ${\mathrm{B}}_2$ and ${\mathrm{B}}_3$ are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of $3 \mathrm{A}$ is recorded by the ammeter A. How much power is dissipated in the circuit when all the three bulbs glow together?

With respect to electric energy, define watt.