What is a Coulomb? Simple Explanation!

Wednesday, February 9, 2022

If you have investigated electric power or amperes you will encounter the term Coulomb.

A Coulomb is the base unit of charge in the SI system of measurement.

A Coulomb is equal to 1/(1.602176634×10−19 

The 1.602176634 x 10 -19 is the charge of a single electron called the elementary charge

You can Think of a coulomb as a bag of electrons.

 It takes 6.24 x 10 18 electrons to make the charge of 1 Coulomb.

A Coulomb is also equal to 1 ampere ( the SI unit for current) times 1 second

1C = 1A x 1s

In other words if the current in a circuit is 1 ampere then 1 Coulomb passes a point each second.

1A = 1C/s

Since Coulomb measures charge, let's talk about charge.

Charge is written with a Q 

Q = N x e

N = number of electrons

e = elementary charge remember roughly 1.6 x 10-19

So in summary,

A Coulomb is a measure of charge

It is equal to 6.24 x 10 18 electrons

Charge is represented with the letter Q


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