Kamis, 28 Februari 2013

LAMP



There are many types of electrical lamps and in each one, electricity is used in slightly different ways to give us light.
In ordinary light bulbs, there is a filament through which runs an electric current, and when this glows, it produces light. If a filament is exposed to air, it will break in a moment that is why it is enclosed in a glass bulb in which there is a vacuum or gas which will not make it burn out.
This type of lamp gives out a warm light. There is also a filament in a halogen lamp, but the bulb is a little cylinder of quartz in which there are vapors of a halogen chemical.
This also gives a beautiful warm light. halogen lamps are often used for car headlights
Fluorescent lamps give out a whiter light, with gas flowing through a current.
This current stimulates the gas electrons which react by giving out light. the gases mostly used are neon, argon, sodium, and mercury.

Vocabulary

• Slightly  : Sedikit
• Different  : Berbeda
• Ways  : Cara
• Exposed  : Terkena
• Current  : Arus
• Vapors  : Uap
• Quartz  : Batu Kuarsa
• Glow  : Memancarkan Cahaya
• Fluorescent  : Berpendar
• Unusual  : Luar biasa
• Common  : Keadaan yang biasa
• Messy  : Morat-marit
•Excellent  : Unggul
• Awesome  : Mengagumkan

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