What is electronics??

The word electronics within itself is complete definition. Electronics is combination of two words electron+mechatronics .
Electronics is the study of  flow of electrons through various materials and devicesIt is the study of their behavior and effects in vacuums, gases, and semiconductors, and with devices using such electrons. 

History of electronics

Actual history began with the invention of vacuum diode by J.A. Fleming, in 1897; and, after that, a vacuum triode was implemented by Lee De Forest to amplify electrical signals.

Atom

An atom is the smallest unit of matter.

Atom is made up of three tiny kinds of particles

I.Protons

II.Neutrons

III.Electrons

 Electronics in daily life

 Instrumentation: Microprocessors can be used as 

controllers in many instruments. They are also 

used in medical instruments to measure blood

 pressure and temperature.

Communication: In the telephone industry, 

microprocessors are used in digital telephone

 sets, telephone exchanges and modems. Satellite

 communication systems, mobile phones and 

televisions are also using microprocessors.

Current

Current is the flow of electric charge carriers like electrons

Current flows from negative to positive points.

Current is measured in Amperes.

VOLTAGE

The pressure used to move electrons is called voltage. Voltage pushes electrical current through conductors just as water pressure pushes water current through pipes.