Define 1 Coulomb

Learn about the definition of 1 coulomb, the SI unit of electric charge, its practical examples, case studies, and statistics. Explore the significance of coulombs in various fields.

Understanding Coulombs

One coulomb is the SI unit of electric charge, defined as the charge transported by a constant current of one ampere in one second. It is named after the French physicist Charles-Augustin de Coulomb, who made significant contributions to the field of electrostatics.

Formal Definition

Formally, one coulomb is equivalent to the charge of 6.242 x 10^18 electrons. It is denoted by the symbol C and is a fundamental unit of measurement in the International System of Units (SI).

Practical Examples

One practical example of a coulomb is the charge stored in a typical AA battery, which is around 2,500 coulombs. Another example is the charge required to move one mole of electrons across a potential difference of one volt, which is approximately 96,500 coulombs.

Case Studies

In real-world applications, the concept of the coulomb is essential in fields such as electronics, telecommunications, and electrochemistry. For example, in telecommunications, the amount of charge stored in capacitors determines the performance of electronic devices. In electrochemistry, the transfer of charge during chemical reactions is measured in coulombs.


According to statistics, the average lightning bolt carries a charge of about 15 coulombs. This immense amount of charge can cause significant damage to structures and even pose a danger to human life.

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