Definition

1. Noun:
   • Filament: A very thin wire, typically made of tungsten, inside an incandescent light bulb. When electricity passes through it, it heats up and glows, producing light.
   • Hairspring: A very fine, spiral spring in a mechanical watch or clock that regulates the speed of the balance wheel, controlling the timekeeping accuracy.

Usage Examples

• Noun (Filament):
  • Bóng đèn này không sáng vì dây tóc bị đứt. (This light bulb doesn't work because the filament is broken.)
• Noun (Hairspring):
  • Người thợ đồng hồ cần thay thế chiếc dây tóc bị hỏng. (The watchmaker needs to replace the broken hairspring.)

Advanced Usage

• The term is a compound noun: dây (wire, string, cord) + tóc (hair). It literally means "hair-thin wire," which accurately describes both its primary meanings.
• In historical or technical contexts, "dây tóc" can refer to the fine wire used in early electronic components, such as in vacuum tubes.

Variants and Related Words

• Bóng đèn dây tóc (n): Incandescent light bulb.
  • Bóng đèn dây tóc tiêu thụ nhiều điện năng hơn đèn LED. (Incandescent light bulbs consume more energy than LED lights.)

Synonyms

• Filament: Thread, wire (specifically within a bulb).
• Hairspring: Balance spring, spiral spring.

Related Terms

• Bóng đèn (n): Light bulb.
• Đồng hồ cơ (n): Mechanical watch/clock.
• Bộ máy đồng hồ (n): Watch/clock movement.

1. Hairspring
   • Filament (trong bóng điện)