Practice over 1000+ GATE-level questions from this topic!
Designed to match the latest GATE pattern with topic-wise precision, difficulty tagging, and detailed solutions.
Two incandescent light bulbs of 40W and 60W rating are connected in series across the mains.
Then
The bulbs together consume 100W
The bulbs together consume 50W
The 60W bulb glows brighter
The 40W bulb glows brighter
The individual light bulbs and their connection is shown below,
Since the first bulb consumes 40W when connected to a 220V supply.
Similarly, the second bulb consumes 60W when connected to a 220V supply.
Power consumption in series combination 
= 24W
So total consumption = 24W
Current in series combination 
Power consumption in 40W bulb = 
= 14.4W
Power consumption in 60W bulb = 
= 9.6W
Hence power consumption in 40W bulb is more, so 40W bulb glows brighter.