For starting out in electronics, first and foremost thing to know is about Atoms. Atoms are the building blocks of everything in our universe. We have a lot of stuff around us. Take anything and start disintegrating it, the basic unit of all matter will be Atom. They are so small that they are not visible by naked eye. They are only visible by high powered strong microscope.

Atoms consist of three small particles: Electrons, Protons and Neutrons These particles have energy in the form of charge. Electrons have negative charge. Protons have positive charge and neutrons are neutral (no charge). Number of electrons in atom is equal to the number of protons in it. Neutrons and protons are packed inside centre of atom called nucleus. Strong central force of nucleus do not allow electrons to move.
Electrons are not part of nucleus, they revolve around the atom at very high speed in orbits. Electrons are very small as compared to other parts. Electrons are always in motion and spin very quickly around the centre. The electrons jump from one area to another. When electrons move in one direction, we say current is flowing. Word “Electronics” is derived from Electrons. Science which deals with the study of electrons is called electronics. Electrons are very powerful in the world of Electronics. These tiny particles stream through wires creating current and electricity.