Elementary charge

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What Wikipedia says

The elementary charge, usually denoted by e, is the magnitude of the charge on an electron and a fundamental physical constant defined to be exactly e = 1.602176634×10−19 C. The elementary charge is a measure of the coupling strength of the electromagnetic force and one of the seven defining constants of the International System of Units (SI).

Excerpt from the Wikipedia article “Elementary charge”, under the CC BY-SA 4.0 license. Read the article on Wikipedia