<P> It is equivalent to the charge of approximately 7018624200000000000 ♠ 6.242 × 10 (6995103600000000000 ♠ 1.036 × 10 mol) protons, and − 1 C is equivalent to the charge of approximately 7018624200000000000 ♠ 6.242 × 10 electrons . </P> <P> 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 . </P> <P> The SI system defines the coulomb in terms of the ampere and second: 1 C = 1 A × 1 s . The second is defined in terms of a frequency naturally emitted by caesium atoms . The ampere is defined using Ampère's force law; the definition relies in part on the mass of the international prototype kilogram, a metal cylinder housed in France . In practice, the watt balance is used to measure amperes with the highest possible accuracy . </P> <P> Since the charge of one electron is known to be about 6981160217662079999 ♠ 1.602 176 6208 (98) × 10 C, 1 C can also be considered the charge of roughly 6.241 509 × 10 ^ electrons or + 1 C the charge of that many positrons or protons, where the number is the reciprocal of 1.602 177 × 10 ^ . </P>

The coulomb which is the unit of charge is the charge on one electron
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