To use all functions of this page, please activate cookies in your browser.

my.chemeurope.com

With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.

- My watch list
- My saved searches
- My saved topics
- My newsletter

## CoulombThe ## Additional recommended knowledge
## Definition1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second. It can also be defined in terms of capacitance and voltage, where one coulomb is defined as one farad of capacitance times one volt of electric potential difference: ## ExplanationIn principle, the coulomb could be defined in terms of the charge of an electron or elementary charge. Since the values of the Josephson (CIPM (1988) Recommendation 1, PV 56; 19) and von Klitzing (CIPM (1988), Recommendation 2, PV 56; 20) constants have been given conventional values (K If two point charges of +1 C are held one meter away from each other, the repulsive force they will feel is given by Coulomb's Law as 8.988×10 ## Historical noteThe ampere was historically a derived unit—being defined as 1 coulomb per second. Therefore the coulomb, rather than the ampere, was the SI base electrical unit. In 1960 the SI system made the ampere the base unit. ## SI multiples
## Conversions- The electrical charge of one mole of electrons (approximately 6.022×10
^{23}, or Avogadro's number) is known as a faraday (actually –1 faraday, since electrons are negatively charged). One faraday equals 96.485 341 5 kC (the Faraday constant). In terms of Avogadro's number (*N*_{A}), one coulomb is equal to approximately 1.036 ×*N*_{A}×10^{−5}elementary charges.
- one ampere-hour = 3600 C
- The elementary charge is 1.602176487×10
^{-19}C
- One statcoulomb (statC), the CGS electrostatic unit of charge (esu), is approximately 3.3356×10
^{-10}C or about 1/3 nC.
- 1 coulomb is the amount of electrical charge in 6.241506×10
^{18}electrons or other elementary charged particles.
## See also- Abcoulomb, a cgs unit of charge
- Statcoulomb, a cgs unit of charge
- Faraday, an obsolete unit
- Coulomb's law
- Current (electricity)
- Faraday constant
- Quantity of electricity
- SI
- Ampere
- Farad
## References1.Kowalski, Ludwik, "A Short History of the SI Units in Electricity", pp. 97-99 vol 24, |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Coulomb". A list of authors is available in Wikipedia. |