Television, stereophonic recording and play back, the computer, robots,
and space probes are all products of electronics. Electronics is the branch of
physics concerned with the generation and behavior of electrons, as in
transistors and electron tubes. It is especially concerned with their use in
electronic devices, in which electricity is used to control, communicate, and
process information. These devices have caused greater changes in everyday life
than those of any other technology introduced in the 20th century.
