Definition

1. Noun:
   • A unit of electrical resistance: The "ohm" is the standard unit for measuring electrical resistance in the International System of Units (SI). It is defined as the resistance between two points in a conductor when a constant potential difference of one volt applied across these points produces a current of one ampere.

Examples of Usage

• Noun:
  • This resistor has a value of 100 ohms.
  • The impedance of the speaker is 8 ohms.
  • According to Ohm's law, voltage equals current multiplied by resistance, measured in ohms.

Advanced Usage

• "Ohmic" (Adjective): Describes a material or component that obeys Ohm's law, meaning its resistance is constant over a range of voltages and currents.
  • A resistor is an ohmic device.
• "Non-ohmic" (Adjective): Describes a material or component (like a diode) that does not obey Ohm's law, as its resistance changes with voltage or current.
  • The light bulb filament is non-ohmic because its resistance increases as it gets hot.

Variants and Related Words

• Ohmmeter (Noun): An instrument used for measuring electrical resistance in ohms.
  • He used an ohmmeter to check the circuit's continuity.
• Megohm (Noun): A unit of electrical resistance equal to one million ohms.
  • The insulation resistance was measured in megohms.

Synonyms

• Unit of resistance: (This is a descriptive synonym, as "ohm" is the specific, standard unit.)

Related Concepts

• Ohm's Law: The fundamental law of electricity stating that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them (V = I * R).
  • Ohm's law is essential for calculating values in simple circuits.
• Resistance (Noun): The property of a material or component to oppose the flow of electric current, measured in ohms (Ω).
  • Copper wire has very low electrical resistance.

Noun

1. German physicist who formulated Ohm's law (1787-1854)
2. a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere