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Understanding How Power is used in a computer: A brief explanation - Page 2

Poll Results: Did you find this write-up to be helpful?

 
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post #11 of 16
Quote:
Originally Posted by coachmark2 View Post

Today’s power supplies are FAR more efficient than past designs, and are called “switching power supplies.” For this guide, I won’t go into all what that means, because THAT’S a whole nother can of worms. wink.gif:

If anyone is interested, Anatomy of a Switching Power Supply

Also, I can honestly say that was a pleasure to read. I enjoy learning about power supplies and how power is used. I feel this should be read by any new forum member so they can understand what a power supply is and what it does, and hopefully let them understand why it is important that they not skimp on a cheap power supply.
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post #12 of 16
Thread Starter 
Quote:
Originally Posted by BSLSK05 View Post

If anyone is interested, Anatomy of a Switching Power Supply
Also, I can honestly say that was a pleasure to read. I enjoy learning about power supplies and how power is used. I feel this should be read by any new forum member so they can understand what a power supply is and what it does, and hopefully let them understand why it is important that they not skimp on a cheap power supply.
I incorporated that into the article, thanks very much for adding.
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post #13 of 16
The assertion that AC power is more dangerous than DC power is not entirely correct. Sure AC power lines are incredibly dangerous due to the high amperages being carried over the line, but all things being equal (15 amps AC vs 15 amps DC all @ 24 volts) I contend that DC is substantially more dangerous. Since AC oscillates you can let go of an ac line when it is actively electrocuting you. If you touch a DC line, you're gonna need an outside force to remove you from the transmission of power to ground. Just my two cents.


Otherwise I really like the article and I think it will be very informative to our members who do not have a good background in electronic circuits. thumb.gif
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post #14 of 16
Hi,
I saw this as an article and replied to that but since it said reply to thread I have pasted that reply here:

Nice article but being a pedant I have to point out a couple of things.

"The advantages of AC power is that it is VASTLY more efficient to send over long distances" that was never true (AC transmission suffers from inductive and capacitive losses plus resistive losses while DC transmission only has resistive loss). Up until recently the transforming of the very high voltages and currents used in long distance DC power transmission was prohibitively expensive, but now it makes economic sense for a few very long high power lines. It is still a very expensive option but due to the lower loss it is worth it in these few cases.

"AC is also far more dangerous" despite what T. Edison tried to make us believe this is not true.
In near lethal situations you have a slightly better chance of releasing your grip on a live wire if the current it carries is AC rather than DC (of the same voltage). I suspect the author is using AC as a euphemism for 120V AC. I have been told (just hearsay of couse) that 120V AC is more likely to produce heart fibrillation than 240V AC (the current being double is more likely to clamp the heart than send it into fibrillation, which in the short term is preferable but still lethal if sustained).

Best regards
Edited by dogphlap - 10/31/12 at 7:07pm
post #15 of 16
Excellent post! Very informative and well written.
Just to throw my .02 in, I agree and disagree with the OP, as others had backed.. How he refers is pretty much correct about AC/DC. Appliance level DC currents aren't very dangerous as compared to line-level A/C but bring them both to the same currents and DC is far more deadly. I've had a few good shocks from both throughout the years and AC is easy to let go of as compared to DC. Actually, the AC shocks typically force me to let go whereas the DC shocks, your muscles contract and won't let you release grip.. Trivial disagreement of the article, but still factual.. Just so someone doesn't take the information the wrong way and end up killing themselves with it(who knows, I've heard a lot worse happen daily)..

None-the-less, this was a very excellent article that I quite enjoyed reading. Thanks for the information!

Best

Deviated09
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post #16 of 16
Your writing method is very similar to mine lol.
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