The emitted lightĪppears yellowish, and a significant portion of energy is lost as heat.

The tungsten wire, the filament's temperature reaches around 3,140 to 4,940 degrees Fahrenheit. When a supply of electrical current passes through Or infused with an inert gas that prevents it from burning up. In most households, the two commonly used types of light fixtures are incandescent bulbs and fluorescent lamps.Īn incandescent bulb consists of a tungsten metal filament inside a sealed glass bulb, which is either evacuated An incandescent bulb produces more heat and radiates less The ultraviolet that is produced into visible light.

The bulb will be tested to make sure they’re up to the job.An incandescent bulb works by using electricity to generate enough heat to make the bulb's filament glowĪnd emit light, while a fluorescent lampÂ functions by colliding gaseous atoms with electronsÂ and transforming The air inside the bulb is taken out and replaced with a gaseous mixture of argon and nitrogen which help ensure a longer-life for the filament. The different parts of the bulb – the glass, the filament and the base – are then assembled by a machine. It’s also labelled with information about the bulb, such as how bright it is. The base of the bulb is assembled from a tiny little circuit board and a plastic casing with indentations in the shape of a screw so that it can easily fit into the light base. It’s then heated to soften the wire and makes the structure more uniform, before the mandrel is dissolved in acid.

The filament is made out of a fine wire that’s wound around a metal bar called a mandrel to mould it into its coiled shape. Such a machine can produce more than 50,000 bulbs each hour! Once cooled, the inside of the glass is coated with a protective chemical to reduce the glare caused by glowing. The molten glass is carried along a conveyor belt and air nozzles blow the glass through holes in the belt into moulds creating the shape of the shell.

To make the shell, the raw materials for glass – sand, soda ash and limestone – are mixed and heated. First you need to know that there are three main sections to a light bulb – the glass shell, the filament that glows and the base that holds the bulb securely.

How does the light bulb work