What Is a Coulomb?

Coulomb (English: Coulomb) is a unit representing the amount of charge, referred to as the library, the symbol C. It is named in honor of the French physicist Charles-Augustin de Coulomb (1736-1806).

coulomb

(Electricity unit)

Coulomb is

Unit of charge: Coulomb

In physics, the amount of charge is called

Character introduction

Charles-Augustin de Coulomb (1736 ~ 1806), French engineer and physicist. Born in Angoulême, France on June 14, 1736. He died in Paris on August 23, 1806.

Coulomb's main contributions are torsion scale experiments, Coulomb's law, and so on. Coulomb's law brings the study of electromagnetics from qualitative to quantitative, which is an important milestone in the history of electromagnetics.

Personal life

Coulomb studied at the Mazalan Academy and the French Academy and served in the military. In 1774 he was elected as a member of the French Academy of Sciences. In 1784, he served as Supervisor of the Water Supply Committee and later Supervisor of the Map Committee. In 1802, Napoleon appointed him as a member of the Board of Education, and in 1805 he was promoted to director of education supervision.

A paper on material strength was published in 1773. The proposed method for calculating the distribution of stress and strain on objects is still in use today (2019) and is the theoretical basis of structural engineering. Research on electrostatic and magnetic issues began in 1777. At that time, the French Academy of Sciences offered a reward for improving the magnetic needle problem in the nautical compass. Coulomb believed that the magnetic needle support on the shaft would inevitably bring friction, and proposed to hang the magnetic needle with fine hair or silk. It was found in the study that the twisting force when the wire is twisted is proportional to the angle that the needle turns, so that this device can be used to measure the magnitude of electrostatic and magnetic forces, which led to his invention of a torsion scale. He also established the law of elastic torsion based on the fact that when the wire or metal filament is twisted, the torque is proportional to the angle that the pointer turns. Based on his analysis of friction in 1779, he proposed a scientific theory on lubricants. In 1781, he discovered the relationship between friction and pressure, and formulated the laws of friction, rolling, and sliding. Designed to work underwater, similar to modern caisson. From 1785 to 1789, the torsional scale was used to measure electrostatic force and magnetic force, and the famous Coulomb's law was derived.

Coulomb's law is the first quantitative law in the history of the development of electricity. It brings the study of electricity from the qualitative into the quantitative phase. It is an important milestone in the history of electricity.