What is remote control? How has it been used in T.V. working? Name the main types of remote control receivers.

Explanation

Remote control is an electronic device which
helps the observer to operate the television from
a distance without leaving his or her seat. In a
remote control, there are three main units.
(i) A transmitting unit: which trasmits the
command signal, (ii) a frequency controller,
which selects the suitable frequency for a
particular function to be performed and (iii) a
mechanical drive or electronic colur unit,
which changes the volume or colour according
to the signal.
There are two mains types of remote control
receivers : (i) Electromechanical system
(ii) Electronic system.