Coulomb

The coulomb is the SI unit of electric charge. One coulomb is the charge transported by a steady current of one ampere in one second.

Electric charge: A fundamental property of matter that causes electric forces and interactions with electromagnetic fields. The coulomb is the SI unit used to quantify this property.
Electric circuit: An interconnected path through which electric current can flow. Circuit measurements determine transferred charge by multiplying current by time.
Coulomb counter: An instrument or circuit that estimates accumulated electric charge by integrating current over time. It reports transferred charge directly in coulombs or related units.
Charles-Augustin de Coulomb: A French physicist whose experiments on electric and magnetic forces helped establish quantitative electrostatics. The unit is named in honor of his work on electric charge and force.
Electric current: The rate at which electric charge passes through a surface. A current of one ampere transports one coulomb each second.
Charge conservation: The principle that total electric charge in an isolated system remains constant. Charge measured in coulombs moves between circuit components without being created or destroyed.
Electrolysis: Chemical change driven by electric current passing through an electrolyte. Faraday’s laws relate the coulombs passed to the amount of substance transformed.
Coulomb balance: A torsion balance used by Charles-Augustin de Coulomb to measure small forces between charged objects. His instrument supplied experimental evidence behind the namesake’s place in electrostatics.
Ampere: The SI base unit of electric current. The coulomb is defined through current multiplied by elapsed time.
Coulomb's law: A law giving the electrostatic force between two point charges as proportional to their product and inversely proportional to distance squared. It uses charge in coulombs to calculate electrostatic force.

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