dynamo

/'dainəmou/

Thân thiện

A cyclist uses a dynamo to power the front light on her bicycle.

Definition

1. Noun:
   • A device that converts mechanical energy into electrical energy: A dynamo is an electrical generator that produces direct current (DC) electricity using a rotating coil (the armature) within a magnetic field.
   • A very energetic and forceful person: (Figurative) A person who is a source of tireless energy, activity, or power.

Usage

• The primary use of "dynamo" is technical, referring to a specific type of electrical generator.
• The figurative use is common in informal contexts to describe a person's character.

Examples

• Technical meaning:
  • The bicycle's headlight was powered by a small dynamo attached to the front wheel.
  • Early factories used steam engines to drive large dynamos for electricity.
• Figurative meaning:
  • She is a real dynamo, organizing the entire event single-handedly.
  • The new manager is a marketing dynamo, full of innovative ideas.

Advanced Usage

• "Human dynamo": A common phrase emphasizing a person's exceptional energy and productivity.
  • Even after a 12-hour shift, he works like a human dynamo.

Variants and Related Words

• Generator: A broader term for any device that converts mechanical energy to electrical energy. A dynamo is a type of generator that produces DC current.
• Alternator: A generator that produces alternating current (AC), commonly used in modern vehicles.
• Dynamoelectric: (Adjective) Relating to the conversion of mechanical energy into electrical energy or vice versa.

Synonyms

• Technical: DC generator, electrical generator.
• Figurative: powerhouse, live wire, ball of fire, go-getter.

Related Phrases

• "A dynamo of activity": A phrase describing a place or person characterized by constant, energetic action.
  • The startup's office was a dynamo of activity, with teams working on multiple projects.

Word Origin

• From the Greek , meaning "power." The term was coined in the 19th century with the invention of the device.

Học thuật

Noun

1. generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature