Ohm

/oum/
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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

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