Coulomb
| Coulomb | |
|---|---|
| Unit system | SI derived unit |
| Unit of | Electric charge |
| Symbol | C |
| Named after | Charles-Augustin de Coulomb |
| 1 C in ... | ... is equal to ... |
| SI base units | A⋅s |
| CGS units | 2997924580 statC |
| Atomic units | 6.24150934(14)e×1018 |
The coulomb (unit symbol: C) is the International System of Units (SI) unit of electric charge. It is the charge (symbol: Q or q) transported by a constant current of one ampere in one second:
Thus, it is also the amount of excess charge on a capacitor of one farad charged to a potential difference of one volt:
It is equivalent to the charge of approximately 6.242×1018 (1.036×10−5 mol) protons, and −1 C is equivalent to the charge of approximately 6.242×1018 electrons.
This SI unit is named after Charles-Augustin de Coulomb. As with every International System of Units (SI) unit named for a person, the first letter of its symbol is upper case (C). However, when an SI unit is spelled out in English, it should always begin with a lower case letter (coulomb)—except in a situation where any word in that position would be capitalized, such as at the beginning of a sentence or in material using title case. Note that "degree Celsius" conforms to this rule because the "d" is lowercase.— Based on The International System of Units, section 5.2.
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