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Simple Definitions

The most important electronics terms, demystified in one place.


Our Take

A unit of charge, consisting of 6.24 x 1018 electrons. It doesn’t take time into consideration and is used infrequently in electronics but is the basis for many other units, such as amps and farads.

Book Definition

It is a large unit for charges. 1C of charge, there are 1/ (1.602 x 10-19) = 6.24 x 1018 electrons.

Fundamentals of Electric Circuits, 5th Edition by Charles K. Alexander and Matthew N. O. Sadiku

Unit of electric charge. 1C= 6.25 X 1018 electrons.

Grob’s Basic Electronics, 11th Edition by Mitchel E. Schultz


The coulomb (symbol:

) is the International System of Units (SI) unit of electric charge. It is the charge (symbol:


) transported by a constant current of one ampere in one second:

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