An electric bulb converts electrical energy into
A) sound energy
B) mechanical energy
C) nuclear energy
D) none of these.

Hint: An electric bulb is a device that is used to provide light so that we can see in the darkness and also the electric bulb works only on electrical energy. The electric bulb has a filament that glows as the electricity is supplied to it.

Complete step by step answer:
The electric bulb was invented by the scientist Edison. It has a filament in closed in the glass bulb to protect it from the oxidation the filament glows due to heat as the electricity is passed through the filament. The filament has two terminals from where the electricity is supplied to the electrical bulb. The filament of the bulb is made up of a thin wire of tungsten material. The tungsten material has high resistance and also it can withstand the high temperature it also has a high melting point and also has good strength, so it means that the filament could reach the high melting point before melting due to all these properties tungsten has selected the filament for the electric bulb. So the electrical energy is converted into light energy by the electric bulb.

Therefore, the correct option for this problem is option D.

Note:
The filament provides a high resistance due to which the filament glows and it is very important to protect the red hot filament from oxidation as the oxidation will decrease the life of the filament it can also break it sometimes and therefore the filament is protected in a bulb. The properties of tungsten are in very much favor of making it as the filament as tungsten has a very high melting point which enables it to glow at high temperature.