Definition

1. Noun:
   • Filament (of an electric lamp/light bulb): A thin wire, typically made of tungsten, inside an incandescent light bulb. It glows white-hot and produces light when an electric current passes through it.

Usage Examples

• Noun:
  • Bóng đèn này không sáng vì sợi đèn đã đứt. (This light bulb doesn't work because the filament is broken.)
  • Khi bật công tắc, dòng điện làm nóng sợi đèn. (When you switch it on, the electric current heats the filament.)

Advanced Usage

• The term "sợi đèn" is specifically used for the filament in traditional incandescent light bulbs. For other light sources like LEDs or fluorescent tubes, different technical terms are used.
• In technical or scientific contexts, the word "dây tóc" (literally "hair-thin wire") is a more common synonym.

Variants and Related Words

• Dây tóc (n): Filament. The standard technical term.
  • Dây tóc vonfram có điểm nóng chảy rất cao. (A tungsten filament has a very high melting point.)
• Bóng đèn sợi đốt (n): Incandescent light bulb (the type of bulb that contains a filament).
  • Bóng đèn sợi đốt tiêu thụ nhiều điện năng hơn đèn LED. (Incandescent light bulbs consume more energy than LED bulbs.)

Synonyms

• Filament: The thin wire inside a bulb that emits light when heated by electricity.

Related Idioms