Question

Two bulbs of equal wattage, one having carbon filament and the other having a tungsten filament are connected in series to the mains, then

• A. Both bulbs glow equally
• B. Carbon filament bulb glows more
• C. Tungsten filament bulbs glows more
• D. Carbon filament bulb glows less

Answer 1

Answer: (C)

Tungsten filament bulbs glows more

Answer 2

Resistance of carbon filament decreases with temperature while that of tungsten increases with temperature In series $P_{Consumed} \propto R$i.e. tungsten bulb will glow more brightly