coulomb

The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). It is defined to be equal to the electric charge delivered by a 1 ampere current in 1 second, with the elementary charge e as a defining constant in the SI.

AI overview

A coulomb is the standard unit used to measure the amount of electric charge, similar to how a kilogram measures weight. It's defined as the amount of charge that flows when an electric current of 1 ampere runs for 1 second, making it essential for quantifying and calculating electricity in science and engineering.

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Key facts

Unit.name: coulomb
Unit.image: Coulomb diagram.svg
Unit.imagesize: 300px
Unit.caption: Diagram showing 1 coulomb (electric charge carried by a current of 1 ampere during 1 second) and the equivalent number of electrons
Unit.standard: SI
Unit.quantity: electric charge
Unit.symbol: C
Unit.namedafter: Charles-Augustin de Coulomb
Unit.units1: SI base units
Unit.inunits1: A⋅s
Unit.units2: CGS units
Unit.inunits2: ≘ 
Unit.units3: Atomic units
Unit.inunits3: ≈

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Wikidata facts

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unit symbol: C
conversion to SI unit: 1
numeric value: 6241509074460762607.7762409809304458998869658961709711215274158092608907689262930544023899427308712080493367125212986972071895
Wikidata SPARQL query equivalent: wd:Q25406 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
NCI Thesaurus ID: C42550
Commons category: Coulomb (charge unit)

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Article

7 sections

Contents

Definition
SI prefixes
Conversions
In everyday terms
Name and history
See also
Notes and references

== Definition == The SI defines the coulomb as "the quantity of electricity carried in 1 second by a current of 1 ampere" by fixing the value of the elementary charge, . Inverting the relationship, the coulomb can be expressed in terms of the elementary charge: 1 ~ \mathrm{C} = \frac{e}{1.602\,176\,634 \times 10^{-19}} \approx 6.241509\times 10^{18} ~ e .