Elementary charge | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Elementary charge


00:01:01 1 As a unit
00:02:19 2 Quantization
00:02:27 2.1 Charges less than an elementary charge
00:03:11 2.2 What is the quantum of charge?
00:04:31 3 Experimental measurements of the elementary charge
00:05:48 3.1 In terms of the Avogadro constant and Faraday constant
00:06:00 3.2 Oil-drop experiment
00:07:29 3.3 Shot noise
00:08:22 3.4 From the Josephson and von Klitzing constants
00:09:28 3.5 CODATA method
00:10:13 4 See also
00:11:49 5 References
00:13:14 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 −e. This elementary charge is a fundamental physical constant. To avoid confusion over its sign, e is sometimes called the elementary positive charge. This charge has a measured value of approximately 1.6021766208(98)×10−19 C (coulombs) and after the 20 May 2019, its value will be exactly 1.602176634×10−19 C by definition of the coulomb. In cgs units, it is 4.80320425(10)×10−10 statcoulombs.The magnitude of the elementary charge was first measured in Robert A. Millikan's oil drop experiment in 1909.