Definition

1. Noun:
   • An instrument for measuring electric current, voltage, or power: An electrodynamometer is a measuring instrument that operates based on the interaction between the magnetic fields produced by two coils—one fixed and one movable. This interaction creates a torque that deflects the movable coil, and this deflection is used to determine the value of the electrical quantity being measured. It is known for its accuracy in measuring both alternating current (AC) and direct current (DC).

Usage Examples

• Noun:
  • The laboratory used a precision electrodynamometer to calibrate the power supply.
  • An electrodynamometer can measure the true power in an AC circuit, unlike some simpler meters.

Advanced Usage

• As a Standard Instrument: Due to its principle of operation, which relies on fundamental electromagnetic forces, the electrodynamometer is often used as a standard or reference instrument for calibrating other, less precise electrical measuring devices.
  • The national standards laboratory maintains an electrodynamometer as a primary standard for power measurement.

Variants and Related Words

• Dynamometer (n): A more general term for an instrument that measures force, torque, or power. In an electrical context, it often refers to the same principle but may not specify the electromagnetic interaction.
• Wattmeter (n): A common type of electrodynamometer specifically designed to measure electrical power in watts.

Synonyms

• Electrodynamic instrument: A broader term for instruments operating on the same principle.
• Electromagnetic meter: A general term for meters that use magnetic fields from electric currents for measurement.

Related Phrases and Technical Terms

• Suspension-type electrodynamometer: A design where the moving coil is suspended by a fine filament or ligament, allowing for very sensitive measurements.
  • The delicate suspension-type electrodynamometer required a vibration-free environment.
• Electrodynamometer movement: Refers to the specific mechanical assembly of coils and a pointer that forms the core of the instrument.
  • The repair involved recalibrating the electrodynamometer movement.

Noun

1. measuring instrument that uses the interaction of the magnetic fields of two coils to measure current or voltage or power