How we measure the electron in on Columbus
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The electron charge, e, can be measured by measuring the current produced by the flow of a known number of electrons. That can be obtained either from chemical reactions in batteries or from little single-electron solid-state devices, or even from vacuum tubes. Putting together e and e/m lets you calculate m.
Electrical charge quantity is not usually measured in terms of the charge on a single electron, because this is an extremely small charge. Instead, the standard unit of electrical charge quantity is the coulomb, symbolized by C, representing about 6.24 x 1018 electrons.
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