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Encyclopedia > Coulomb

The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb. Look up C, c in Wiktionary, the free dictionary. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ... Portrait of Coulomb Charles Augustin de Coulomb (June 14, 1736 – August 23, 1806) was a French physicist. ...

Contents

Definition

1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second. In electricity, current refers to electric current, which is the flow of electric charge. ... Current can be measured by a galvanometer, via the deflection of a magnetic needle in the magnetic field created by the current. ... Look up second in Wiktionary, the free dictionary. ...

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

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: Examples of various types of capacitors. ... Josephson junction array chip developed by NIST as a standard volt. ... Potential difference is a quantity in physics related to the amount of energy that would be required to move an object from one place to another against various types of force. ...

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

Explanation

The coulomb is also the unit of electric flux. (See Gauss Law.) In physics, Gausss law gives the relation between the electric flux flowing out a closed surface and the charge enclosed in the surface. ... In physics, Gausss law gives the relation between the electric flux flowing out a closed surface and the charge enclosed in the surface. ...


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 ≡ 4.835 979×1014 Hz/V and RK ≡ 2.581 280 7×104 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 65×1018 elementary charges. Combined with the present definition of the ampere, this proposed definition would make the kilogram a derived unit. e- redirects here. ... The elementary charge (symbol e or sometimes q) is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single electron. ... The magnetic flux quantum Φ0 is the quantum of magnetic flux passing through a superconductor. ... The quantum Hall effect is a quantum mechanical version of the Hall effect, observed in two-dimensional systems of electrons subjected to low temperatures and strong magnetic fields, in which the Hall conductance σ takes on the quantized values where e is the elementary charge and h is Plancks... Current can be measured by a galvanometer, via the deflection of a magnetic needle in the magnetic field created by the current. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et...


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 8.988×109 N [1]. This is roughly equal to the gravitational force of 900,000 metric tons of mass at the surface of the Earth; in everyday terms, it's enough force to accelerate an Airbus A380 airplane up to a final speed of 76,857 km/h in 1 second. In everyday life, most things don't have a large surplus of charge. This page is a candidate for speedy deletion. ... The metre, or meter (symbol: m) is the SI base unit of length. ... In physics, force is an influence that may cause an object to accelerate. ... Coulombs torsion balance In physics, Coulombs law is an inverse-square law indicating the magnitude and direction of electrostatic force that one stationary, electrically charged object of small dimensions (ideally, a point source) exerts on another. ... This article covers the physics of gravitation. ... The Airbus A380 is a double-deck, four-engined airliner manufactured by EADS (Airbus S.A.S.). It is the largest passenger airliner in the world. ...


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. Current can be measured by a galvanometer, via the deflection of a magnetic needle in the magnetic field created by the current. ...


In 1960 the SI system made the ampere the base unit (See http://alpha.montclair.edu/~kowalskiL/SI/SI_PAGE.HTML).


SI multiples

Multiple Name Symbol Multiple Name Symbol
100 coulomb C      
101 decacoulomb daC 10–1 decicoulomb dC
102 hectocoulomb hC 10–2 centicoulomb cC
103 kilocoulomb kC 10–3 millicoulomb mC
106 megacoulomb MC 10–6 microcoulomb µC
109 gigacoulomb GC 10–9 nanocoulomb nC
1012 teracoulomb TC 10–12 picocoulomb pC
1015 petacoulomb PC 10–15 femtocoulomb fC
1018 exacoulomb EC 10–18 attocoulomb aC
1021 zettacoulomb ZC 10–21 zeptocoulomb zC
1024 yottacoulomb YC 10–24 yoctocoulomb yC

Conversions

  • The electrical charge of one mole of electrons (approximately 6.022×1023, 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 (NA), one coulomb is equal to approximately 1.036 × NA ×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 3.3356×10-10 C or about 1/3 nC.
  • 1 coulomb is the amount of electrical charge in 6.241506×1018 electrons or other elementary charged particles.
  • The charge of one electron is equal to -1.6022×10-19 C
This SI unit is named after Charles-Augustin de Coulomb. As for all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (C). But when an SI unit is spelled out, it should always be written in lowercase (coulomb), unless it begins a sentence or is the name "degree Celsius".
— Based on The International System of Units, section 5.2.

The mole (symbol: mol) is the SI base unit that measures an amount of substance. ... Avogadros number, also called Avogadros constant (NA), named after Amedeo Avogadro, is formally defined to be the number of carbon-12 atoms in 12 grams (0. ... In physics, the faraday (not to be confused with the farad) is a unit of electrical charge; one faraday is equal to the charge of 6. ... I am the man. ... An ampere-hour (abbreviated as A·h) is a unit of electric charge. ... The statcoulomb (statC) or franklin (Fr) or electrostatic unit of charge (esu) is the physical unit for electrical charge used in the centimetre-gram-second (cgs) electrostatic system of units. ... This article or section is in need of attention from an expert on the subject. ... e- redirects here. ... Image File history File links SI_Brochure_Cover. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... Portrait of Coulomb Charles Augustin de Coulomb (June 14, 1736 – August 23, 1806) was a French physicist. ... Majuscules or capital letters (in the Roman alphabet: A, B, C, ...) are one type of case in a writing system. ... Minuscule, or lower case, is the smaller form (case) of letters (in the Roman alphabet: a, b, c, ...). Originally alphabets were written entirely in majuscule (capital) letters which were spaced between well-defined upper and lower bounds. ... Celsius is, or relates to, the Celsius temperature scale (previously known as the centigrade scale). ...

See also


  Results from FactBites:
 
Coulomb Force Gizmo | ExploreLearning (187 words)
Place fixed charges on a two‑dimensional grid before firing a moving charge (velocity can be adjusted).
The velocity of the charge will be acted on and altered by the Coulomb forces.
We're sorry, but JavaScript is required to access ExploreLearning's Gizmos.
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