ROBERT MILLIKAN (1868-1953)

1909 – USA

‘The charge on the electron’

Millikan measured the charge on the electron.

Photograph of ROBERT ANDREWS MILLIKAN ©

ROBERT ANDREWS MILLIKAN

His experiment showed that the electron is the fundamental unit of electricity; that is, electricity is the flow of electrons. From the experiment Millikan calculated the basic charge on an electron to be 1.6 × 10-19 coulomb. This charge cannot be subdivided – by convention this charge is called unit negative, -1, charge.

Millikan also determined that the electron has only about 1/1837 the mass of a proton, or 9.1 × 10-31 kilogram.

picture of the Nobel medal - link to nobelprize.org
Wikipedia-logo © (link to wikipedia)

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