ohm
C2Formal / Technical
Definition
Meaning
A unit of electrical resistance in the International System of Units (SI).
By extension, it can refer to the physical property of resistance itself in a material, or to a specific resistor component with a given resistance value.
Linguistics
Semantic Notes
The word is exclusively used in scientific and technical contexts related to electricity and electronics. It is not a polysemous word in standard English and carries no figurative meanings.
Dialectal Variation
British vs American Usage
Differences
No differences in meaning, spelling, or pronunciation. Identical technical usage.
Connotations
None. Purely technical term.
Frequency
Identically low in everyday usage; high frequency within electrical engineering, physics, and related technical fields.
Vocabulary
Collocations
Grammar
Valency Patterns
[Number] + ohm(s)a + [Adjective] + ohm + resistorVocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Not applicable for this technical term.”
Usage
Context Usage
Business
Rare; may appear in procurement or specification documents for electronic components.
Academic
Common in physics and electrical engineering textbooks, papers, and lectures.
Everyday
Extremely rare outside of specific hobbies (e.g., audio equipment, DIY electronics).
Technical
The primary domain. Ubiquitous in circuit design, component datasheets, and measurements.
Examples
By Part of Speech
verb
British English
- Not applicable.
American English
- Not applicable.
adverb
British English
- Not applicable.
American English
- Not applicable.
adjective
British English
- The circuit requires an ohm-value resistor.
American English
- Check the ohm rating on that speaker.
Examples
By CEFR Level
- The light bulb has a resistance.
- This resistor is 100 ohms.
- Resistance is measured in ohms.
- According to Ohm's Law, voltage equals current times resistance in ohms.
- You'll need a precision resistor with a tolerance of ±1 ohm.
- The Thévenin equivalent impedance of the network was calculated to be approximately 50 ohms.
- Parasitic trace resistance on the PCB added a few milliohms to the total circuit impedance.
Learning
Memory Aids
Mnemonic
Think of 'OHM' as 'O' for 'Opposition' to electrical current, with 'HM' sounding like a thoughtful hum when you're calculating resistance.
Conceptual Metaphor
Often conceptualized as a form of FRICTION or NARROWING OF A PIPE for electrical current.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with the Russian word 'ом' (a type of elm tree).
- The pronunciation is similar to the Russian word for 'him' (него in certain cases), but this is coincidental.
Common Mistakes
- Pronouncing it as /ɒm/ (like 'mom') instead of the diphthong /oʊm/ or /əʊm/.
- Using it as a countable noun without a number (e.g., 'It has high ohm' instead of 'It has high resistance' or 'It is X ohms').
Practice
Quiz
What does 'ohm' measure?
FAQ
Frequently Asked Questions
No, it is a specialised scientific term used primarily in physics and engineering.
It is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law.
The capital Greek letter omega: Ω.
Yes, as a unit of measurement, it takes a regular plural 'ohms' when referring to a quantity (e.g., 'ten ohms').