Question

Two incadesecent light bulbs of 40W and 60 W rating are connected in series across the mains Then

• A. the bulb together consume 100W
• B. the bulb together consume 50 W
• C. the 60 W bulb glows brighter
• D. the 40 W bulb glows brighter

Answer 1

The correct option is D the 40 W bulb glows brighter

$\because P\propto \frac{1}{R}$

Therefore, resistance of 40W bulb > resistance of 60W bulb.

For series connection, current through both the bulbs will be same $P=I^{2}R$ (for series connection)

Power consumed by 40W bulb > power consumed by 60 W bulb.

Hence, The 40 W bulb glows brighter.