write about structure of electric bulb
Answers
The electric bulb contains a glass covering on top with a filament attached to a circuit.
The filament is made up of tungsten because the filament should be heated that high that it produces light and the melting point of tungsten is very high ( around 3000°C )
The light bulb consists of three main parts which are the filament, the glass bulb and the base of the light bulb....
The filament: It is a coiled thin wire that made of tungsten and it is connected with copper and lead wires that are connected to the base of the lamp.
When the electricity reaches the tungsten filament through copper and lead wires, It causes the glowing of the filament and emitting the light.
The filament is made of tungsten because it has a high melting point that prevents the melting of the filament at high temperatures. the filament heats up and emits the light when the electric current passes through it.
Copper and lead wires allow the electric current to pass from the base of the light bulb to the tungsten filament.
The glass bulb: It is made of thin glass and contains one type of inert gases as argon gas instead of air. The glass bulb prevents the air from reaching the filament to protect it from burning.
Argon gas increases the lifetime of the filament of the light bulb because it does not burn and does not help in burning as it is inactive gas so, it protects the filament from burning.
The base of the light bulb: It carries the light bulb in an upright position and it connects the light bulb to the electric circuit.
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