Introduction

Basic introduction:

                                                

Welcome to this blog. This blog provides an overview of the basics of electrical and electronics engineering that are required at undergraduate level, efforts have been taken to keep the complexity level of the subject to bare minimum so that the students of either circuit branch or non-circuited branched  can easily understand the basics. As a part of this  we have to study the fundamentals such as network theory, electromagnetism, electrical machines, measuring instruments, transformers, electronics devices and circuits,semiconductor devices, digital electronics and integrated circuits. 

Here we you go to 1st major important chapter in field of electricity i.e, network theory. 
The basic question is  "what is network "?
                  Ans:  Network means an arrangement of the various electric energy sources along with the different circuit elements.
                   Next one is different types of network elements.
In electric circuits,we can classify the circuit elements as
1)Active and passive elements :
The connection of passive and active elements by means of conductor is called an active network. If the active  sources are absent,it is called passive network.

a).Active elements: These are voltage sources and current sources and these are also energy sources.(or) The devices or components which produce energy in the form of Voltage or Current are called as Active Components

Examples:Generators,vacuum tubes,transistors etc.

b).Passive elements:A passive element is an electrical component that does not generate power, These elements either dissipates energy in the form of heat or store energy.

Examples:Resistors(R),capacitors(C),inductors(L).

2)Lumped and distributed elements:

a).Lumped elements:Physically separate elements such as resistors,capacitors and inductors are has called lumped elements.

b).Distributed elements: 

A Distributed elements is one which cannot be separated for the purpose of analysis. A transmission line distributed R,C,l along its length.

3).Bilateral and unilateral elements:These components include controlled & uncontrolled source of energy, resistors, capacitors, inductors, etc. Analysis of these circuits refers to the calculations required to end the unknown quantities like power, voltage and current connected with one or more components in the circuit. 

a)Bilateral elements:

In this the voltage current relation is the same for current flowing in either direction

Examples:Resistors(R),inductor (L),capacitor(C)

b)Unilateral elements:

A Unilateral element has different relations between voltage and current for the two possible directions of current

Examples: Vacuum tubes,silicon diodes,metal rectifiers etc.

4).Linear and non-linear elements:

An element is said to be linear, if it satisfies the linear voltage-current relationship i.e, V-I relationship should be linear, otherwise it is said to be non-linear.