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Difference Between Alternating Current(AC) and Direct Current(DC)

Last Updated on January 31, 2019 by Swagatam Leave a Comment

In this post we try to investigate the mains differences between alternating current (AC) and direct current (DC).

Table of Contents
  • Overview
  • Difference Between AC and DC

The word AC and DC are pretty common with electronics and we all come across it while developing or dealing electronic circuit designs.

Overview

Though the terms are very ordinary with the field, many noobs become confused with them as far as the technical difference is concerned.

For the newcomers in the field of electronic the following note will prove quite useful, lets learn exactly what;s the difference between alternating and direct current or simply AC and DC.

As the name refers to an alternating current is a current which alternates or fluctuates between a certain positive and negative voltage levels.

The intermediate area of the positive and the negative extremes of the above voltage levels is the zero level or the neutral level.

Before we begin, let me inform the readers that here "current flow" refers to the position of the flowing electrons while passing through a conductor at any particular instance of time.

The level of displacement of the electron depends on the voltage, which is the source responsible for making the electrons move (My Definition of Current).

Difference Between AC and DC

Looking at the diagram, we see at at any instance AC fluctuates between zero to the positive peak, then it returns back to zero and heads for the negative and finally back to zero.

The cycle continues many times per second depending upon the frequency of the signal.

An AC can be sinusoidal or square wave type. A sinusoidal or sine type AC makes the above alterations in an exponential form, meaning the rise and the fall proceeding of the waves vary instantaneously with time and takes the form of the wave as shown in the diagram.

A square wave AC differs with a sine AC as it does not vary its shape with time rather the rise and fall are in the shape of definite square or rectangle waveforms.

warning message: electricity is dangerous, proceed with caution

Image courtesy: en.wikipedia.org/wiki/File:Types_of_current.svg

A direct current, again as the name refers to is "direct" by nature, meaning they do not generate oscillations or waves like an AC.

Thus a DC will never have a varying polarity neither a frequency.

A DC will be either a negative with reference to zero or positive with reference to zero but never be simultaneously.

An alternating current can be easily converted to DC with the help of rectifying devices called the diodes which may be configured as bridge networks for implementing the conversions.

Similarly a DC can be also be converted to AC using some special electronic circuits, it's a little complicated than converting AC to DC though.

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  • 5.  Constant Current Generator Circuits Explained
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Filed Under: Electronics Theory Tagged With: AC, Alternating, Between, Current, Difference, Direct

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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