The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb [1] (1736 to 1806).
Definition[]
1 coulomb is the amount of electric charge carried by a current of 1 ampere flowing for 1 second.
Explanation[]
The coulomb could in principle be defined in terms of the charge of an electron or elementary charge. Since the values of the Josephson constant [2] (CIPM (1988) Recommendation 1, PV 56; 19) and von Klitzing constant [3] (CIPM (1988), Recommendation 2, PV 56; 20) constants have been given conventional values (K_{J} ≡ 4.835 979^{14} Hz/V and R_{K} ≡ 2.581 280 7×10^{4}Ω), it is possible to combine these values to form an alternative (not yet official) definition of the coulomb. A coulomb is then equal to exactly 6.241 509 629 152 65 x 10^{18} elementary charges. Combined with the current definition of the ampere, this proposed definition would make the kilogram a derived unit.
SI multiples[]
Multiple | Name | Symbol | Multiple | Name | Symbol |
---|---|---|---|---|---|
10^{0} | coulomb | C | |||
10^{1} | decacoulomb | daC | 10^{−1} | decicoulomb | dC |
10^{2} | hectocoulomb | hC | 10^{−2} | centicoulomb | cC |
10^{3} | kilocoulomb | kC | 10^{−3} | millicoulomb | mC |
10^{6} | megacoulomb | MC | 10^{−6} | microcoulomb | µC |
10^{9} | gigacoulomb | GC | 10^{−9} | nanocoulomb | nC |
10^{12} | teracoulomb | TC | 10^{−12} | picocoulomb | pC |
10^{15} | petacoulomb | PC | 10^{−15} | femtocoulomb | fC |
10^{18} | exacoulomb | EC | 10^{−18} | attocoulomb | aC |
10^{21} | zettacoulomb | ZC | 10^{−21} | zeptocoulomb | zC |
Conversions[]
- One mole of electrons (approximately 6.022 10^{23}, or Avogadro's number [4]) is known as a faraday (actually -1 faraday, since electrons are negatively charged). One faraday equals 96.485 341 5 kC (the Faraday constant [5]). In terms of Avogadro's number (N_{A}), one coulomb is equal to approximately 1.036 x N_{A} x 10^{−5} elementary charges.
- one ampere-hour = 3600 C
- The elementary charge is approximately 160.2176 zC.
- One statcoulomb (statC), the CGS electrostatic unit of charge (esu), is approximately 3.3356 x 10^{−10}C or about 1/3 nC.
See also[]
- Coulomb's law [6]
- Current (electricity)
- Faraday constant
- Quantity of electricity
- SI
- Ampere
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