Coulomb is the unit of charge, referred to as the library for short, and is expressed by C. The relationship expressed by the basic unit is "second ampere (s a)". It was named in memory of French physicist Charles Augustine de Coulomb (1736 ~ 1806).

The conversion relationship between coulomb and other electrical units is:

1C is equivalent to 3× 109CGS electrostatic unit (esu).

1C is equivalent to 0. 1CGS electromagnetic system electric quantity unit (emu).

1 coulomb = 1 amp 1 sec.

Extended data

Coulomb's law was put forward by French physicist Coulomb in his paper "The Law of Electricity" in 1785.

Coulomb's law is not only the basic law of electromagnetism, but also one of the basic laws of physics. Coulomb's law clarifies the law of interaction between charged bodies, determines the nature of electrostatic field, and lays the foundation for the whole electromagnetism.

The influence of Coulomb's work on French physicists can also be confirmed by Laplace's later Outline of Physics. The most basic starting point of this brief program of physics is to simplify all physical phenomena into attraction and repulsion between particles. Electric or magnetic motion is the attraction and repulsion between charged particles or charged particles. This simplification promotes the application of analytical mathematics in physics.