Incandescent Electric Lamp

Give any one advantage of LEDs over conventional incandescent low power lamps

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is the mercury used in the manufacture of these lamps ?

As electric lamp and a conductor of resistance 4 Omega are connected in series to a 6 V battery. The current drawn by the lamp is 0.25 A. Find the resistance of the electric lamp.

The resistance of an incandescent lamp is

Why are filaments of incandescent lamps made of thin tungsten wire ?