Electronic Devices and Circuits

In science we study about the laws of nature and its verification and in technology, we study
the applications of these laws to human needs.
Electronics is the science and technology of the passage of charged particles in a gas or vacuum
or semiconductor.
Before electronic engineering came into existence, electrical engineering flourished. Electrical
engineering mainly deals with motion of electrons in metals only, whereas Electronic engineering
deals with motion of charged particles (electrons and holes) in metals, semiconductors and also in
vacuum. Another difference is, in electrical engineering the voltages and currents are of very
high-kilovolts, and Amperes, whereas in electronic engineering one deals with few volts and rnA. Yet
another difference is, in electrical engineering, the frequencies of operation are 50 Hertzs/60 Hertzs,
whereas in electronics, it is KHzs, MHz, GHzs, (high frequency).
The beginning for Electronics.was made in 1895, when H.A. Lorentz postulated the existence
of discrete charges called electrons. Two years later, J.J.Thomson proved the same experimentally
in 1897.