coulomb
Very LowTechnical / Scientific
Definition
Meaning
The SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.
In physics and engineering, a fundamental unit for quantifying electric charge, crucial for calculations involving capacitance, current, and electrochemical processes.
Linguistics
Semantic Notes
Almost exclusively used in scientific contexts (electromagnetism, electrochemistry). The term is a proper noun derived from the scientist Charles-Augustin de Coulomb. It is not used figuratively.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences. Pronunciation differs slightly.
Connotations
None beyond its precise scientific definition.
Frequency
Equally low frequency in both dialects, confined to technical fields.
Vocabulary
Collocations
Grammar
Valency Patterns
[number] coulomb(s) of chargea charge of [number] coulomb(s)[noun] measured in coulombsVocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Virtually never used.
Academic
Core term in university-level physics, electrical engineering, and chemistry courses.
Everyday
Extremely rare; would only appear in explanations of batteries or lightning.
Technical
Fundamental and frequent in technical specifications, research papers, and engineering calculations involving electricity and magnetism.
Examples
By Part of Speech
noun
British English
- The capacitance is one farad if it stores one coulomb of charge for one volt.
- A typical smartphone battery has a capacity of several thousand coulombs.
American English
- The lightning bolt transferred an estimated 15 coulombs of charge.
- Calculate the total charge, in coulombs, that has passed through the circuit.
Examples
By CEFR Level
- A coulomb is the unit for measuring electric charge.
- One ampere of current represents a flow of one coulomb of charge per second.
- The experiment required measuring tiny charges in the order of nanocoulombs.
- The repulsive force between the two protons can be calculated directly using Coulomb's law, which depends on the product of their charges in coulombs.
- The coulomb efficiency of the battery, a critical performance metric, had degraded to 97.5% after 500 cycles.
Learning
Memory Aids
Mnemonic
Remember Charles-Augustin de COULOMB, who studied electric force. The unit of charge, the COULOMB, carries his name for the quantity his law describes.
Conceptual Metaphor
ELECTRIC CHARGE IS A FLUID (measured in discrete 'containers' or units called coulombs).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Direct cognate: 'кулон'. However, in Russian, 'кулон' primarily means a pendant (piece of jewellery), while the scientific unit is also 'кулон'. This can cause initial confusion or amusement.
Common Mistakes
- Mispronouncing it as /kəˈluːm/ or /ˈkaʊləm/.
- Confusing it with 'Columbus' (the explorer).
- Using it in non-scientific contexts.
- Incorrect capitalisation (it is not capitalised in running text, unlike the symbol 'C' for the unit).
Practice
Quiz
Which of the following best describes a coulomb?
FAQ
Frequently Asked Questions
No, it is a specialised scientific term used almost exclusively in physics and engineering contexts.
An ampere is the unit of electric current, defined as one coulomb of charge passing a point per second (1 A = 1 C/s).
Yes, as a standard unit of measurement, it takes a regular plural 'coulombs' (e.g., 'several coulombs').
Coulomb's Law states that the electrostatic force between two point charges is directly proportional to the product of their charges (in coulombs) and inversely proportional to the square of the distance between them.