Early Deveploments in Electronics

Electronics deals with the emission, behavior, and effects of electrons and with electronic devices. it evolved separately from electricity in 1887 when the English physiscist JJ Thomson measured the charged to the mass ratio (e/m) of the electron and when the American physiscist Robert A. Milikan measured its electrical charge in 1909.

 

J.J. Thompson with the tube used to identify electrons 

 

Milikan with his cloud chamber used to measure the charge of an electron