The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb (1736 to 1806). The International System of Units (abbreviated SI from the French language name Système International dUnités) is the modern form of the metric system. ... ‹ The template below has been proposed for deletion. ... Portrait of Coulomb Charles Augustin Coulomb (June 14, 1736 – August 23, 1806) was a French physicist. ...

Definition

1 coulomb is the amount of electric charge carried by a current of 1 ampere flowing for 1 second. In electricity, current refers to electric current, which is the flow of electric charge. ... The ampere (symbol: A) is the SI base unit of electric current equal to one coulomb per second. ... Look up second in Wiktionary, the free dictionary. ...

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 (CIPM (1988) Recommendation 1, PV 56; 19) and von Klitzing (CIPM (1988), Recommendation 2, PV 56; 20) constants have been given conventional values (K_J ≡ 4.835 979×10¹⁴ Hz/V and R_K ≡ 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 current definition of the ampere, this proposed definition would make the kilogram a derived unit. Properties The electron is a fundamental subatomic particle that carries a negative electric charge. ... 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... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ...

SI multiples

Conversions

• 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 (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 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.

The mole and its simple conversions into different units of measurements. ... Avogadros number, also called Avogadros Constant (NA) is a large constant used in chemistry and physics. ... 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. ... In physics and chemistry, the Faraday constant is the amount of electric charge of one mole of electrons. ... 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. ... CGS is an acronym for centimetre-gram-second. ...

See also

• Coulomb's law
• Current (electricity)
• Faraday constant
• Quantity of electricity
• SI
• Ampere