Basic Concepts: Resistance, Capacitance and Inductance

     In this second post of the blog, I'll be introducing some basic concepts about electronics that are a necessary and important. I'll be telling basics about  resistances, capacitance and inductance.

     Starting with resistance, it is the property of a material to oppose the flow of electric current through it. Resistance offered differs from one substance to another. The substance which offer lower resistance is called a conductor, for e.g., metals. The substance which has high resistance is called an insulator, for e.g., non metals, rubber, glass,etc. The unit for measuring resistance is ohm and

symbolized as Ω. A conductor is said to have resistance of one ohm if a potential difference of 1 volt is applied and current of 1 ampere passes through it.

     The resistance of conductor is directly proportional to its length, inversely proportional to area of its cross section, nature of material and temperature of the conductor itself. The electronic component used in circuits to provide resistance is called a Resistor.

      Moving on to inductance, it is a property of conducting coil that opposes any change in current flowing through it. This property can be understand easily with help of Lenz's Law which says "If an induced current flows, its direction is always such that it will oppose the change which produced it."

Inductance can be defined as ratio of flux linkage to the current flowing through coil. Unit of inductance is henry and symbolized as H. The component used in circuit is called an Inductor.

     The inductance of an inductor is directly proportional to square of number of turns and area of cross section, it is inversely proportional to length and depends on absolute permeability of magnetic material.

     

     Finally capacitance, it is the property of the electronic component capacitor to store the charge when its plates are at different potentials. If Q coulombs of charge is applied to one of the plates of a capacitor and potential difference of V volt is applied between the two plates its capacitance is given by  C=Q/V. The unit of capacitance is farad, with f as symbolic representation.

     Capacitance of the capacitor is directly proportional to area of plates, inversely proportional to distance between two plates and depends on absolute permeability of the medium between the plates. The medium use is generally a dielectric substance.

   The next post will be most probably about basic components that we use, symbols, and much more interesting...

Introduction to Electronics

     Well here is the very first post of the blog, where I'll just give some introduction to the world of electronics. Electronics has become an inseparable part of our life.
     If we observe the word  "Electronics" properly, we can separate it into two different words electron and mechanics. As we know an electron is a sub atomic particle with negative(-) charge, and mechanics is what we generalize here as working of any system or an individual subject. So, we can say that Electronics is basically electron mechanics. Well this is just understanding the word Electronics.
      Electronics can be divided in two parts, viz. digital electronics and analog electronics. Analog electronics is generally related to communication systems, amplifiers, power supplies,and system related to signals which vary continuously with respect to time(analog signals). On other hand digital electronics deals with studies of computing electronics with use of only two electric levels, high(binary 1) and low(binary 0). Today combination of analog and digital electronics is no rare sighting.

Electronic Components

     The future posts will be about designing circuits, projects, and side by side I'll also be posting few mathematics related to electronics. Before we head to that part, I'll be introducing some basics for practically starting with electronics, then may be you're a student or you're doing it just for hobby or anything you wish to do.
      In next few post I'll be introducing basic tools, components, laws and configurations to get started with electronics. I hope this first post didn't bored you. Any suggestions and if mistakes found are really appreciated in comments.