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`        A 25  w, 220v and a 500 w, 220 v bulb glow at normal brightness when connected across the terminal of a batteries. When they are connected in series across the same material, 500 W bulb glows dimly. How could this happen?`
2 years ago

Pratikshya kafle
13 Points
```							When bulb rated different powers are connected in series,Brightness is inversely proportional to power rated i.e bulb rated high power glows dimly and bulb rated less power glows brightly.Since 500w>25w, 500w bulb glow dimly.
```
2 years ago
Sanju
106 Points
```							We have, Power, P = V2 / R   -----------------------------------> Eqn 1where, V is the voltage and R is the resistance.Eqn 1 tells that rated power of the bulb is inversely proportional its resistance.Therefore, 25 W bulb has the highest resistance compared to 500 W bulb.When they are connected in series, the same amount of current passes through both 25W and 500W bulb.We have, Power, P = I2 R   --------------------------->Eqn 2Since the current is same, the power dissipation will be higher for the bulb with higher resistance according to Eqn 2. We know that R(25W bulb) > R(500W bulb)So, bulb with 25W will have more power dissipation and glows brighly whereas, 500W bulb will have least power dissipation and glows dimly.Hope it helps.Approve if u like it.
```
2 years ago
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• 18 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions