Introduction to Electonics

The world Electronics means "electron mechanics" , It is a science which deals with the motion of electrons under the influence of electric or magnetic field , The ability to control electron flow is usually applied to information handling or device control ,thus giving rise to two field of engineering disciple Electronics & Telecommunication engineering.

All electronic circuits however complicated contains a large number of some basic electronics components
these components are either brought individually and are assembled together on a circuit board using soldering or through the process of micro-miniaturisation (reduction in size) are reduced to  extremely small dimension to make an integrated circuit (IC) , IC  revolutionized the world of electronics today .As many circuits which once used to be impossible to make once (late in 1948s) as it contains many thousands of components, can be made(fabricated) today on a single semiconductor chip. 
Electronics components are mainly divided into two parts Active components and passive components 

• Active components - those devices which are capable of amplifying or processing an electrical signal .    eg Transistor, silicon controlled rectifier (SCR)
• Passive components - Those devices which have neither of the feature of active components and are generally incapable of power gain , But can dissipate or store energy. eg Resistor , capacitor , inductor