Elementary electric charge | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-28

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Elementary_charge


00:01:05 1 As a unit
00:02:23 2 Quantization
00:02:37 2.1 Charges less than an elementary charge
00:03:28 2.2 What is the quantum of charge?
00:05:04 3 Experimental measurements of the elementary charge
00:06:38 3.1 In terms of the Avogadro constant and Faraday constant
00:06:50 3.2 Oil-drop experiment
00:08:35 3.3 Shot noise
00:09:38 3.4 From the Josephson and von Klitzing constants
00:10:55 3.5 CODATA method
00:11:48 4 See also
00:13:39 5 References
00:15:24 6 Further reading



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SUMMARY
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The elementary charge, usually denoted by e or sometimes qe, is the electric charge carried by a single proton or, equivalently, the magnitude of the electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant. To avoid confusion over its sign, e is sometimes called the elementary positive charge. 
From the 2019 redefinition of SI base units, that took effect on 20 May 2019, its value is exactly 1.602176634×10−19 C by definition of the coulomb. In the centimetre–gram–second system of units (CGS), it is 4.80320425(10)×10−10 statcoulombs.Robert A. Millikan's oil drop experiment first measured the magnitude of the elementary charge in 1909.