unpowered

Thân thiện

An autogiro flies using its unpowered rotating wings.

Definition

Adjective 1. Not having or using power; lacking a source of mechanical or electrical energy. - Describes a device, vehicle, or system that operates without an engine, motor, or other source of generated power. Its motion or function is typically dependent on external forces like wind, gravity, or human effort.

Usage

The adjective "unpowered" is used to describe objects that function without an internal power source. It is often used in technical, engineering, or recreational contexts to contrast with "powered" equivalents. - It typically precedes the noun it modifies (e.g., an unpowered vehicle). - It can be used in a predicate position after a linking verb like "is" or "was" (e.g., The device is unpowered).

Examples

• The glider is an unpowered aircraft that relies on air currents to stay aloft.
• Early flight experiments involved unpowered gliders launched from hills.
• The laboratory test used an unpowered prototype to study basic aerodynamics.
• Many toys, like simple pull-back cars, are unpowered and rely on kinetic energy.

Advanced Usage

• "Unpowered flight": Refers to the flight of objects like gliders, paper airplanes, or seeds (e.g., maple seeds) that do not use propulsion.
  • The study of unpowered flight is crucial for understanding aerodynamics.
• "Unpowered descent": Describes a controlled fall or landing without engine thrust, such as a spacecraft re-entering the atmosphere or an aircraft gliding after engine failure.
  • The astronauts practiced procedures for an unpowered descent.

Variants and Related Words

• Powered (adj.): The direct antonym, meaning equipped with a source of mechanical or electrical power.
  • A powered wheelchair offers greater independence.
• Non-powered: A near-synonym sometimes used interchangeably, though "unpowered" is more common for mechanical systems.
• Manual (adj.): Often used for tools or devices operated by human power, which is a specific type of unpowered operation.
  • A manual pump can be used when electricity fails.

Synonyms

• Engine-less
• Motorless
• Passive (in specific technical contexts, e.g., a passive solar heater)

Antonyms

• Powered
• Motorized
• Mechanized
• Electric

Học thuật

Adjective

1. not having or using power
   • an autogiro is supported in flight by unpowered rotating wings