ohmmeter

/'oum,mi:tə/

Thân thiện

An electrician uses an ohmmeter to check a circuit.

Definition

1. Noun:
   • An instrument for measuring electrical resistance: An ohmmeter is a device used to measure the electrical resistance of a component or circuit, with the result displayed in ohms (Ω).

Examples of Usage

• Noun:
  • The technician used an ohmmeter to check the resistance of the wire.
  • Before installing the resistor, verify its value with an ohmmeter.

Advanced Usage

• "To take a reading with an ohmmeter": To measure and obtain a resistance value using the device.
  • To test the circuit, first take a reading with an ohmmeter across the two terminals.

Variants and Related Words

• Multimeter (n): A more general electronic measuring instrument that typically includes functions for measuring resistance (as an ohmmeter), voltage, and current.
  • A digital multimeter can function as a voltmeter, ammeter, and ohmmeter.

Synonyms

• Resistance meter: A general term for a device that measures electrical resistance.

Related Phrases and Usage Notes

• "Zero the ohmmeter" or "Null the ohmmeter": The adjustment made to set the instrument's reading to zero before taking a measurement, often by shorting the test leads together.
  • Always zero the ohmmeter to ensure an accurate measurement.
• "Infinite resistance reading on an ohmmeter": A reading indicating an open circuit or a break in continuity.
  • If the ohmmeter shows infinite resistance, the fuse is likely blown.

Học thuật

Noun

1. a meter for measuring electrical resistance in ohms