AC voltage, DC voltage, AC current and DC current

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Discussion Overview

The discussion centers on the differences between AC (alternating current) and DC (direct current) voltage, exploring the nature of potential differences in these two types of electrical systems. Participants seek clarification on how AC voltage behaves compared to DC voltage, with a focus on practical implications and definitions.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Meta-discussion

Main Points Raised

  • One participant notes that AC is typically the result of an alternating voltage, while DC results from a constant voltage, questioning the terminology around "AC potential difference."
  • Another participant seeks clarification on how voltage alternates in practice, suggesting a misunderstanding of the nature of AC voltage.
  • A response explains that alternating voltage varies over time, typically moving smoothly from zero to a positive value, then to a negative value, and back to zero, with specific reference to the frequency of cycles in different regions.
  • A participant shares links to resources intended to help others understand the basics of electricity, including a tutorial and a Navy training course, indicating a personal bias based on their own learning experience.
  • Further comments reflect on the quality of Navy training in the past, with participants sharing their experiences and expressing appreciation for the education received.

Areas of Agreement / Disagreement

The discussion contains a mix of clarifications and personal anecdotes, with no clear consensus on the terminology or implications of AC versus DC voltage. Participants express differing levels of understanding and experience without resolving the initial questions posed.

Contextual Notes

Some participants reference specific educational resources and personal experiences, which may influence their perspectives on the topic. The discussion does not resolve the initial inquiry about the terminology and nature of AC and DC voltage.

rama1001
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Hi,
I know that existence of AC and DC currents but what exactly the same with AC and DC potential difference. Of-course it was very basic question and i apologize if it annoys any. Please explain the difference only in terms of voltage.

Thank you.
 
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AC is normally the result of an alternating voltage and DC is the result of a constant voltage. One does not normally speak of "an AC potential difference".
 
How the Voltage alternates practically? You mean changing the volatge over and over like 12v, 15v, 18v,7v and so on when the load is on.
 
NO, I mean using an alternating source. You really should look up AC generators.
 
often it's good to look up the verb in an unfamiliar phrase.

ALTERNATING means it's switching direction at regular interval, just as [STRIKE]a pendulum[/STRIKE] (oops - clocks are digital nowadays so make that ) a child on a swing.

So the voltage varies in time typically going smoothly from zero to some positive value, then to equal negative value, then back to zero and so on.

In US, power at your wall socket makes sixty such cycles every second. Much of rest of worls is 50 cycles. Those poor folks in Japan have my sympathy - part of their country is 50 and part 60.
 
rama1001, After some searching I found this simple “tutorial”, or “teach yourself” to help you get a grasp of Electricity:

“This tutorial is a brief introduction to the concepts of charge, voltage, and current. This tutorial is not as long and tedious as a college textbook, yet it contains more information than students are likely to find in an elementary schoolbook.”
http://www.swansontec.com/set.html

I first learned electronics in Navy schools, so I am a little biased. So, if someone is serious about learning electricity and electronics, this free downloadable book is the best choice possible!
“Here is the "Electricity - Basic Navy Training Courses" (NAVPERS 10622) in its entirety (or will be eventually). It should provide one of the Internet's best resources for people seeking a basic electricity course - complete with examples worked out (links to quizzes at end of chapters).
Electricity - Basic Navy Training Courses
NAVPERS 10622
PREFACE
This book is intended as a basic reference for all enlisted men of the Navy whose duties require them to have a knowledge of the fundamentals of electricity.”
http://www.rfcafe.com/references/electrical/Electricity%20-%20Basic%20Navy%20Training%20Courses/electricity%20-%20basic%20navy%20training%20courses.htm
 
Last edited by a moderator:
Good for you BobbyW !

1960's and 70's Navy training was excellent. It produced exreemely competent people.
 
Thx, Old Jim!

AFU-A (32 weeks) and AQF (12 weeks) at NATTC, Memphis, 1961

After the USN, jobs were plentiful. I was especially welcomed everywhere because of that training!

Cheers, Bobbywhy
 

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