Why is parallel arrangement used in domestic wiring?

${\mathrm{B}}_1 , {\mathrm{B}}_2$ 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 $\mathrm{A}$.

What happens to the glow of the other two bulbs when the bulb $B_1$ 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 $\mathrm{A}$.

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 $\mathrm{A}$.

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

Three incandescent bulbs of $100 \mathrm{W}$ each are connected in series in an electric circuit. In another set of three bulbs of the same wattage are connected in parallel to the same source. Will the bulb in the two circuits glow with the same brightness? Justify your answer.

Three incandescent bulbs of $100 \mathrm{W}$ each are connected in series in an electric circuit. In another set of three bulbs of the same wattage are connected in parallel to the same source. Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.