Introduction

ELECTRICITY  
It is the branch of physics which deals with the study of interaction of one charge to the another charge. It can be divided into two part : 
        (i) Static Electricity          (ii) Current Electricity
(a)     Static Electricity : The branch of physics which deals with the study of the electric charges at rest and their effects is known as electrostatic or static electricity.
(b)     Current Electricity : The branch of physics which deals with the study of the electric charges in motion and their effects is known as current electricity.

Use of Electricity:  We use electricity for many purposes to make our tasks easier. For example, we use electricity to operate pumps that lift water from wells or from ground level to the roof top tank. Electricity makes it possible to light our homes, roads, offices, markets and factories even after sunset. This helps us to continue working at night.

Source of Electricity: Mainly two types of Sources of Electricity
1.    Power Station: It is  a Main Source of Electricity. It produces and supply huge amount of Electricity. All the high voltage equipment get the supply from power station.    

2.    Electric Cells (Batteries) :It gives little amount of Electricity. It is portable and safe.