Answer :
Final answer:
In both series and parallel circuits, the 100W, 220V bulb will glow brighter than the 50W, 220V bulb because it is designed to dissipate more power and therefore emit more light at the specified voltage.
Explanation:
When comparing two light bulbs with power ratings of 50W and 100W both designed for 220V in series and parallel circuits, the brightness is determined by power dissipation. For bulbs in series, the brightness is proportional to the resistance since the same current flows through both. The 100W bulb has lower resistance than the 50W bulb (as determined by P=V2/R, where P is power, V is voltage, and R is resistance). T
hus, in series, the 100W bulb, having a lower resistance, will dissipate more power and therefore glow brighter. When connected in parallel, each bulb receives the full voltage, so they both operate at their designated power ratings. Therefore, the 100W bulb will again be brighter as it's designed to emit more light at the specified voltage.
In summary, for both series and parallel circuits, the 100W bulb will glow brighter due to its design for higher power dissipation at the given voltage.