arc-lamp

An engineer tests an arc-lamp in a dark laboratory.

Definition

1. Noun:
   • A type of electric lamp: An "arc lamp" produces light by creating an electric arc between two electrodes (usually carbon rods) in a gas-filled or open-air environment. It emits an intensely bright light.

Usage Examples

• Noun:
  • The old film studio used an arc-lamp to light the large set. (A high-intensity electric lamp using an electric arc.)
  • Streetlights in the early 20th century were often arc-lamps, casting a brilliant glow. (Historical lighting technology.)

Advanced Usage

• "Arc lamp" vs. "incandescent lamp": An arc lamp is distinct because it generates light through an electric arc rather than a heated filament. It is much brighter but requires more power and maintenance.
  • The arc-lamp was preferred for outdoor lighting because of its superior brightness, but it was eventually replaced by more efficient lamps. (Comparison of lighting technologies.)

Variants and Related Words

• Arc light (n): the light emitted by an arc lamp.
  • The arc light was so strong it could illuminate an entire football field. (The specific type of light produced.)

Synonyms

• Electric arc lamp: a more formal term for the same device.
• Carbon arc lamp: a subtype where the electrodes are made of carbon.

Phrasal Verbs

• Arc over: to form an electric arc across a gap (often used in engineering contexts).
  • If the voltage is too high, the current may arc over between the terminals. (The arc jumps across the gap.)

Related Idioms

• "Strike an arc": to initiate an electric arc, especially in welding or lamp operation.
  • The technician had to strike an arc to start the lamp. (Begin the electric arc.)