A 100 W bulb B1two 60 W bulb B2 and B3 are connected to a 250 V source as shown in the figure. Now W1, W2 and W3 are the output powers of the bulbs B1, B2 and B3 respectively. Then
W1 < W2< W3
Voltage across B3 is greatest; hence B3 will show maximum brightness. In series combination of bulbs, the bulb of lesser wattage will glow more bright.
Hence W2> W1.So, W1 < W2< W3.