Electric Bulbs And Lamps


 
 
Concept Explanation
 

Electric Bulbs And Lamps

Lighting: Electric light is produced by passing an electric current through a substance that either glows when current flows through it or causes another substance to glow. The most important types of electric light sources are the incandescent filament lamp and the electric discharge lamp.

Incandescent Filament Lamps: Light is produced by a thin tungsten wire, or filament, heated to a very high temperature by an electric current passing through it. The heated filament glows with an intense while light but does not burn up because it is enclosed in a sealed glass bulb from which the air has been removed.

Electric Discharge Lamps: In this type of lamp, electric current passes through a gas or vapour, rather than through a filament. The gas or vapour is usually sealed in a bulb or tube that has an electrode at each end. Current applied to the electrodes causes some of the gas or vapour atoms to become ionised (electrically charged). When enough atoms are ionised, the gas becomes an electric conductor. Current flows from one electrode to the other through the gas, causing it to produce radiation. In most lamps, this radiation is a visible light; however, the fluorescent lamp consists of invisible ultraviolet rays.

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