Coulomb - wikipedia Coulomb For other uses, see Coulomb ( disambiguation ). Coulomb Unit system SI derived unit Unit of Electric charge Symbol C Named after Charles - Augustin de Coulomb Unit conversions 1 C in...... is equal to... SI base units A ⋅ s CGS units 2997924580 statC Atomic units 6.241 509 34 ( 14 ) e × 10 ^ The coulomb ( 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 : 1 C = 1 A ⋅ 1 s ( displaystyle 1 ~ ( \text ( C ) ) = 1 ~ ( \text ( A ) ) cdot 1 ~ ( \text ( s ) ) ) Thus, it is also the amount of excess charge on a capacitor of one farad charged to a potential difference of one volt : 1 C = 1 F ⋅ 1 V ( displaystyle 1 ~ ( \text ( C ) ) = 1 ~ ( \text ( F ) ) cdot 1 ~ ( \text ( V ) ) ) 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. Contents 1 Name and notation 2 Definition 3 SI prefixes 4 Conversions 5 Relation to elementary charge 6 In everyday terms 7 See also 8 Notes and references Name and notation 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. Definition 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. 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 ^. The proposed redefinition of the ampere and other SI base units would have the effect of fixing the numerical value of the elementary charge to an explicit constant expressed in coulombs, and therefore it would implicitly fix the value of the coulomb when expressed as a multiple of the fundamental charge ( the numerical values of those quantities are the multiplicative inverses of each other ). SI prefixes SI multiples for coulomb ( C ) Submultiples Multiples Value SI symbol Name Value SI symbol Name 10 C dC decicoulomb 10 C daC decacoulomb 10 C cC centicoulomb 10 C hC hectocoulomb 10 C mC millicoulomb 10 C kC kilocoulomb 10 C μC microcoulomb 10 C MC megacoulomb 10 C nC nanocoulomb 10 C GC gigacoulomb 10 C pC picocoulomb 10 C TC teracoulomb 10 C fC femtocoulomb 10 C PC petacoulomb 10 C aC attocoulomb 10 C EC exacoulomb 10 C zC zeptocoulomb 10 C ZC zettacoulomb 10 C yC yoctocoulomb 10 C YC yottacoulomb Common multiples are in bold face. See also SI prefix. Conversions One coulomb is the magnitude ( absolute value ) of electrical charge in 6.241 509 34 ( 14 ) × 10 ^ protons or electrons. The inverse of this number gives the elementary charge of 6981160217662079999 ♠ 1.602 176 6208 ( 98 ) × 10 C. The magnitude of the electrical charge of one mole of elementary charges ( approximately 6.022 × 10, or Avogadro 's number ) is known as a faraday unit of charge ( closely related to the Faraday constant ). One faraday equals 96 485.3399 coulombs. In terms of Avogadro 's number ( N ), one coulomb is equal to approximately 1.036 × N × 10 elementary charges. One ampere - hour = 3600 C ∴ 1 mA ⋅ h = 3.6 C. One statcoulomb ( statC ), the obsolete CGS electrostatic unit of charge ( esu ), is approximately 3.3356 × 10 C or about one - third of a nanocoulomb. Relation to elementary charge The elementary charge, the charge of a proton ( equivalently, the negative of the charge of an electron ), is approximately 6981160217662079999 ♠ 1.602 176 6208 ( 98 ) × 10 C. In SI, the elementary charge in coulombs is an approximate value : no experiment can be infinitely accurate. However, in other unit systems, the elementary charge has an exact value by definition, and other charges are ultimately measured relative to the elementary charge. For example, in conventional electrical units, the values of the Josephson constant K and von Klitzing constant R are exact defined values ( written K and R ), and it follows that the elementary charge e = 2 / ( K R ) is also an exact defined value in this unit system. Specifically, e = ( 6991200000000000000 ♠ 2 × 10 ) / ( 7004258128070000000 ♠ 25 812. 807 × 7005483597900000000 ♠ 483 597. 9 ) C exactly. SI itself may someday change its definitions in a similar way. For example, one possible proposed redefinition is `` the ampere... is ( defined ) such that the value of the elementary charge e ( charge on a proton ) is exactly 6981160217648699999 ♠ 1.602 176 487 × 10 coulombs '', ( in which the numeric value is the 2006 CODATA recommended value, since superseded ). This proposal is not yet accepted as part of the SI. In everyday terms The charges in static electricity from rubbing materials together are typically a few microcoulombs. The amount of charge that travels through a lightning bolt is typically around 15 C, although large bolts can be up to 350 C. The amount of charge that travels through a typical alkaline AA battery from being fully charged to discharged is about 5 kC = 5000 C ≈ 1400 mA ⋅ h. The hydraulic analogy uses everyday terms to illustrate movement of charge and the transfer of energy. The analogy equates charge to a volume of water, and voltage to pressure. One coulomb equals ( the negative of ) the charge of 7018624000000000000 ♠ 6.24 × 10 electrons. The amount of energy transferred by the flow of 1 coulomb can vary ; for example, 300 times fewer electrons flow through a lightning bolt than in the discharge of an AA battery, but the total energy transferred by the flow of the lightning 's electrons is 300 million times greater. See also Abcoulomb, a cgs unit of charge Ampère 's circuital law Coulomb 's law Electrostatics Elementary charge Faraday ( unit ), an obsolete unit Quantity of electricity Notes and references ^ Jump up to : 6.241 509 34 ( 14 ) × 10 ^ is the reciprocal of the 2010 CODATA recommended value 1.602 176 565 ( 35 ) × 10 ^ for the elementary charge in coulomb. Jump up ^ `` SI Brochure, Appendix 1, '' ( PDF ). BIPM. p. 144. Jump up ^ `` SI brochure, section 2.2. 2 ''. BIPM. Jump up ^ `` SI brochure, section 2.2. 1.3 ''. BIPM. Jump up ^ `` SI brochure, section 2.2. 1.4 ''. BIPM. ^ Jump up to : `` Watt Balance ''. BIPM. ^ Jump up to : `` CODATA Value : elementary charge ''. The NIST Reference on Constants, Units, and Uncertainty. US National Institute of Standards and Technology. June 2015. Retrieved 2015 - 09 - 22. 2014 CODATA recommended values ^ Jump up to : Mills, I.M. ; Mohr, P.J. ; Quinn, T.J. ; Taylor, B.N. ; Williams, E.R. ( 2005 ). `` Redefinition of the kilogram : a decision whose time has come ''. Metrologia. 42 ( 2 ) : 71. Bibcode : 2005Metro... 42... 71M. doi : 10.1088 / 0026 - 1394 / 42 / 2 / 001. Jump up ^ Report of the CCU to the 23rd CGPM Jump up ^ Martin Karl W. Pohl. `` Physics : Principles with Applications '' ( PDF ). DESY. Jump up ^ Hasbrouck, Richard. Mitigating Lightning Hazards, Science & Technology Review May 1996. Retrieved on 2009 - 04 - 26. Jump up ^ How to do everything with digital photography -- David Huss, p. 23, at Google Books, `` The capacity range of an AA battery is typically from 1100 -- 2200 mAh. '' SI units Authority : International System of Units ( BIPM ) Base units ampere candela kelvin kilogram metre mole second Derived units with special names becquerel coulomb degree Celsius farad gray henry hertz joule katal lumen lux newton ohm pascal radian siemens sievert steradian tesla volt watt weber Other accepted units astronomical unit bar dalton day decibel degree of arc electronvolt hectare hour litre minute minute of arc neper second of arc tonne atomic units natural units See also Conversion of units Metric prefixes Proposed redefinitions Systems of measurement Book Retrieved from `` https://en.wikipedia.org/w/index.php?title=Coulomb&oldid=806844735 '' Categories : SI derived units Units of electrical charge Talk Contents About Wikipedia Afrikaans অসমীয়া Asturianu Azərbaycanca বাংলা Беларуская Беларуская ( тарашкевіца ) ‎ Български བོད ་ ཡིག Bosanski Brezhoneg Català Čeština Cymraeg Dansk Deutsch Dolnoserbski Eesti Ελληνικά Español Esperanto Euskara فارسی Français Gaeilge Galego 한국어 Հայերեն हिन्दी Hornjoserbsce Hrvatski Bahasa Indonesia Íslenska Italiano עברית ქართული Қазақша Kreyòl ayisyen Kurdî Latviešu Lietuvių Ligure Limburgs Magyar Македонски മലയാളം मराठी Bahasa Melayu Монгол Nederlands 日本 語 Nordfriisk Norsk Norsk nynorsk Occitan Oʻzbekcha / ўзбекча پنجابی Piemontèis Polski Português Română Русский Scots Sicilianu Simple English Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் Татарча / tatarça Türkçe Українська اردو Tiếng Việt ייִדיש 粵語 中文 Edit links This page was last edited on 24 October 2017, at 14 : 26. 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Question: what is the charge in coulombs of an electron
Answer: 1.6021766208(98)×10−19 C