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The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb.

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Wikipedia About Coulomb

The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb.

Definition

1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second.

1 \ \mathrm{C} = 1 \ \mathrm{A} \cdot 1 \ \mathrm{s}

It can also be expressed in terms of capacitance and voltage, where one coulomb is equal to one farad of capacitance times one volt of electric potential difference:

1 \ \mathrm{C} = 1 \ \mathrm{F} \cdot 1 \ \mathrm{V}

Explanation

In 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 (KJ ≡ 4.835 979e: 14 Hz/V and RK ≡ 2.581 280 7e: 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 65e: 18 elementary charges. Combined with the present definition of the ampere, this proposed definition would make the kilogram a derived unit.

In everyday situations, positive and negative charges are usually balanced out. According to Coulomb's Law, two point charges of +1 C, one meter apart, would experience a repulsive force of 9e: 9 N, roughly the equivalent of 900,000 metric tons of weight.

Historical note

The 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 made the ampere the base unit.

Conversions

  • The electrical charge of one mole of electrons (approximately 6.022e: 23, or Avogadro's number) is known as a faraday (actually –1 faraday, since electrons are negatively charged). One faraday equals 96485.3399 coulombs (the Faraday constant). In terms of Avogadro's number (NA), one coulomb is equal to approximately 1.036 × NA e: −5 elementary charges.
  • one ampere-hour = 3600 C
  • The elementary charge is 1.602176487e: -19 C
  • One statcoulomb (statC), the CGS electrostatic unit of charge (esu), is approximately 3.3356e: -10 C or about 1/3 nC.
  • 1 coulomb is the amount of electrical charge in 6.241506e: 18 electrons or other elementary charged particles.

See also

  • Abcoulomb, a cgs unit of charge
  • Statcoulomb, a cgs unit of charge
  • Faraday (unit), an obsolete unit
  • Coulomb's law
  • Current (electricity)
  • Faraday constant
  • Quantity of electricity
  • SI
  • Ampere
  • Ampère's circuital law
  • Farad

Search results for Coulomb

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coulomb. Definition from Wiktionary, a free dictionary. Jump to: navigation, search ... coulomb. Plural. coulombs. coulomb (plural coulombs) ...en.wiktionary.org/wiki/coulomb

Coulomb biography

Biography of Charles Augustin Coulomb (BB^Y-1806) ... At this stage in his education there was a crisis for Coulomb. ... Coulomb graduated in November 1761. ...www-groups.dcs.st-and.ac.uk/~history/Biographies/Coulomb.htm...

Coulomb's Law

Coulomb's Law. Inverse Square Law. Newton's Laws and the Electrical Force ... The symbol k is a proportionality constant known as the Coulomb's law constant. ...www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l3b.htm...

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Conservatism Is Politics For Kindergartners

Common DreamsSecluded genius like Cavendish, who discovered Coulomb's and Ohm's laws decades prior to those men after whom respective laws were named and never publicized his work, is rather exception than rule. Science is essentially social enterprise, contrary ... http://www.commondreams.org/archive/2007/08/03/2954/

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Chinese Say They're Building 'Impossible' Space Drive

WiredChinese researchers claim they've confirmed the theory behind an "impossible" space drive, and are proceeding to build a demonstration version. If they're right, this might transform the economics of satellites, open up new possibilities for space ... http://blog.wired.com/defense/2008/09/chinese-buildin.html

Coulomb Technologies to Present Smart Charging Infrastructure for Plug ...

The Auto ChanelCAMPBELL, Calif.--Coulomb Technologies CEO Richard Lowenthal will be a featured presenter on Wednesday, September 17, 2008 at 2:00 pm during the AlwaysOn GoingGreen conference in Cavallo Point in Sausalito, CA. Mr. Lowenthal will showcase the future ... http://www.theautochannel.com/news/2008/09/15/109390.html

Search results for Coulomb

Coulomb summary

Charles Augustin Coulomb (1736-1806) ... Charles Coulomb worked on applied mechanics but he is best known for his work on electricity and magnetism.http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/C...

Coulomb Consulting - Home

A WebsiteBuilder Website ... Business & Product Development for the Portable Power Industry. Specializing in Battery & Power Managementhttp://www.coulombconsulting.com/

Coulomb

Charles-Augustin de Coulomb b. June 14, 1736, Angoulême, France d. Aug. 23, 1806, Parishttp://www.geocities.com/bioelectrochemistry/coulomb.htm

coulomb - Definition at Your Dictionary

noun. the basic unit of electric charge in the SI and MKS systems, equal to the charge of 6.281 × 10 electrons; the charge carried by a current of one ampere in one second: abbrev ... http://www.yourdictionary.com/coulomb

coulomb - Hutchinson encyclopedia article about coulomb

Simulation time has been dramatically reduced by an embedded "MD Engine(R)," a dedicated computation board for high-speed computation of nonbonded interactions such as coulomb ... http://encyclopedia.farlex.com/Coulomb
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Answers for Coulomb

Leigh DIf there is a voltage drop of 1.5 V across a resistor, how much energy does each Coulomb of electrons lose ?Leigh DKhoiWhat is the number of extra electrons needed to accumulate a charge of 1 Coulomb.?Khoii don't get what it means by 'extra' electrons, but if you're working out the number for 1 Coulomb, then it's going to be 1/(1.6E-19) which will turn out to be a very big number indeed. If by 'e...Mary EHow many electrons are there in 1 coulomb of charge?Mary EIf the charge on the electron is e = 1.6021176462 x 10^-19 C. Then in 1 coulomb of charge there will be: - number of electrons = 1/1.6021176462 x 10^-19 Which is 6.241509745 x 10^18 electrons...evenstar03How do you do a Coulomb force calculation?evenstar03Force = (permitivitty of medium) x (product of charges) / d^2 F = { (permitivitty) x q1 x q2} / d^2 where d is distance usually the medium is free space, and is such termed the permitivitty of free...Mabelle Chelsea PHow many electrons are ejected from a particle with a 1C (coulomb) charge?Mabelle Chelsea PThe answer to your first question is that the charge on one electron is 1.6E-19 coulomb so 1 coulomb is 1/1.6E-19 = just over 6 000 000 000 000 000 000 electrons. The answer to your second question i...
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