Electricity

Electricity has an important role in modern society. In a span of more than 900 years, electricity convenient and widely used forms of energy in the world. One of the practical advantages of electricity as a form of energy, is that it can readily transmitted over considerable distances with relatively small loss in energy. This makes it possible to supply electricity from a central generating plant to any location.

It is of two types:

• Static Electricity
• (Current Electricity

STATIC ELECTRICITY:

A Physical phenomena produced due to charges at rest is known as static electricity.

Ex. When we rub a glass rod with silk the glass rod gets positive charge on it and equal and opposite charge (i.e. the -ve charge) gets developed on the silk. Similarly on a rubbing an ebonite rod with the fur of a cat the ebonite rod get negative charge on it and equal and opposite charge (i.e. the +ve charge) gets developed on the fur of a cat.

CURRENT ELECTRICITY:

A Physical phenomena produced due to charges in motion is known as current electricity. e.g. electric current we use in our houses is current electricity.

PROPERTIES OF ELECTRIC CHARGE

The unit of electric charge is coulomb and 1 coulomb is the charge contained in 6 × 10–18 electrons. Unlike (opposite) charges attract each and like (similar) charges repel each other.