What is columbs?

Coulombs, denoted by the symbol C, is the unit of electric charge in the International System of Units (SI). It is named after the French physicist Charles-Augustin de Coulomb, who is best known for his work on the laws of electrostatics. One coulomb of electric charge is defined as the charge that passes through a cross section of a conductor in one second when a current of one ampere flows through it. Alternatively, one coulomb can be defined as the amount of charge carried by approximately 6.24 x 10^18 electrons (the charge of one electron is around 1.6 x 10^-19 coulombs). Coulombs are commonly used in the study of electricity, electronics, and electromagnetism.