A 100W and 200W domestic bulb joined in parallel are connected to the mains. Which bulb will glow more brightly
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When these bulb are connected in series than current in both bulb is same, and Watt consumed can be given as i^2 x R, as Resistance of 60 W bulb is more than 100W bulb, so it will consume more power and glow brighter than 100W bulb.
When these bulb are connected in parallel, voltage across both bulb is same and power consumption will be V^2/R. In this case bulb with low resistance will consume more power and glow brighter than the bulb with high resistance, so 100W bulb will glow brighter than 60W bulb
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