Basics of circuit theory in tamil 

Differences between Electrical and Electronics
Concept of an Electric Charge
Coulomb's law
Electric Potential
Electrostatics:
Electrostatics is the study of charges at rest.
Electric charges are fundamental in nature. There are two types of charges and can be produced by friction.
When a glass rod is rubbed with a silk cloth, some electrons from glass rod are migrated into the silk cloth.
This makes the glass rod positively charged due to loss of electrons in it and the silk cloth negatively charged due to excess of electrons in it. Similarly, when the plastic rod is rubbed with fur, electrons migrate from the fur into the plastic rod making the rod negative and the fur positive. Also there is a force of attraction between the glass rod and silk cloth.
There is a force of repulsion between similarly charged bodies and a force of attraction between oppositely charged bodies.
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