Electric Bulbs And Lamps
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.
Students / Parents Reviews [10]
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10thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
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Shivam Rana
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Ayan Ghosh
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8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
