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 Electronic Theory and Principle Discussion of electrical theory, law, etc.

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#1
10-25-2006
 Slartibartfast 1kW User Join Date: Oct 2006 Location: Boston, MA Posts: 230 Thanks: 0 Thanked 0 Times in 0 Posts
FAQ for the basics?

You know what would be really great, a faq for electronics basics. Stuff like the relationship between amperage and wattage and all those little formulas. I'm sure most of you guys can spout some of this stuff off the top of your head, but for a guy like me who hasn't had any electronics in 8 years and went to a liberal arts college....
#2
10-25-2006
 talc micro ATX User Join Date: Oct 2006 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts

You can probably find a slew of them on the internet but the following would be the most basic of the basic.

Volts = I x R (I don't remember why but I stands for current - in otherwords Amps)

Power = V x I ( Power is measured in Watts)

From here you just use basic math to get whatever you want.
Since V=IR then V/R = I or V/I = R
You can then substitute these in the power formula
thus
Power = V x V/R to give (VxV)/R or V^2 /R
similarly
Power = IR x I to give I^2 x R

Resistors in Series Add while resistors in parallel follow the inverse.
IE in Series R total = R1+R2+R3+...
in Parallel 1/Rtotal = 1/R1+1/R2+1/R3 ... and the final result for the resitance should always be lower than the lowest value of the resistors in parallel.

Series is where the current flows through all of the resistors and parallel is where the current splits among the resistors. I tried to give an illustration but it got all wacked when the format changed from the entry box to the forum listing so you can look for an example using google if you don't remember.

Capacitors are the same formula but just reversed.
Series is 1/C= 1/C1+1/C2+1/C3......
Parallel is C=C1+C2+C3

Capacitors and Inductors get into inductive and capacitive loads. Formulas can involve imaginary numbers relating to phase shifts and is less intuitive (at least to me than resistive ciruits)

These are the basic fundamentals without going into Kerchoffs rule or other ones related to circuits.
#3
10-25-2006
 GalvanizedYankee Old knuckel bustin' wrench twister Join Date: Oct 2006 Location: SoCal Moderator Posts: 1,051 Thanks: 0 Thanked 0 Times in 0 Posts
Gotta love DIY sites from the UK

These two sites have served this old diesel mechanic very well.

httP://www.cpemma.co.uk/index.html

httP://www.kpsec.freeuk.com/index.htm

jonny's links page has an ohm's law calculator at the bottom.
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#4
10-25-2006
 jonnyGURU Site Founder Join Date: Oct 2006 Location: jonnyGURU forums, of course! Posts: 15,184 Thanks: 485 Thanked 1,962 Times in 1,215 Posts

Things like these, I'll just add to the links page.

When the information is out there, I hate "stealing it" by copy and paste, but I will certainly link up good information.
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Rest in peace Joerg Theissen, aka "GI Joe"
#5
10-27-2006
 talc micro ATX User Join Date: Oct 2006 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts

There may be better sites that cover basic theory on electricity and electronic theory but I found this one when I did a quick google. It seems to cover the basics quite well although there appear to be some sections of "The first eleven" that are missing. The home page is http://www.st-andrews.ac.uk/~www_pa/...o/electron.htm

Some people may find the newsgroups faqs found at http://www.repairfaq.org/ interesting. A quick glance shows that some of the information may be quite old (but basic physics never changes - just the application of it's principles).

#6
10-28-2006
 talc micro ATX User Join Date: Oct 2006 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts

The above liink while good is rather simplified. The following contains course level information that goes well beyond the basics. Once again there may be better sites and leave it for others to point them out.

These four books are from the Department of Energy and cover the gamut.

http://www.eh.doe.gov/techstds/stand...11/h1011v1.pdf

http://www.eh.doe.gov/techstds/stand...11/h1011v2.pdf

http://www.eh.doe.gov/techstds/Stand...11/h1011v3.pdf

http://www.eh.doe.gov/techstds/stand...11/h1011v4.pdf

The following site starts with a list that you can choose individual sections on to test your knowledge. They are questions with answers later on. At the bottom of the page are actual courseware material complete with questions and answers to help clarify the actual course material.

http://www.ibiblio.org/kuphaldt/socr...c/topical.html

I will search no further as these links cover basic info or refresher data to complete courses that prepare one to be an electronic technician.
#7
10-29-2006
 GalvanizedYankee Old knuckel bustin' wrench twister Join Date: Oct 2006 Location: SoCal Moderator Posts: 1,051 Thanks: 0 Thanked 0 Times in 0 Posts

I like that last link talc. (ibiblio)

Slart, check out the tutorials at top center http://www.uoguelph.ca/~antoon/index.htm
The Mrs. Field's Cookies recipe on the left is worth a look.

Sorry for a broken link. I deleted it.
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Worth a good looking over. http://www.badcaps.net/

Last edited by GalvanizedYankee; 10-29-2006 at 04:40 PM. Reason: delete broken link
#8
10-29-2006
 madmat Just kidding, not banned Join Date: Oct 2006 Location: In yer 'fridge, eatin' yer pizza Posts: 1,785 Thanks: 0 Thanked 1 Time in 1 Post

Back in the day it was like this: Wattage = Voltage multiplied by Amperage divided by resistance or in the case of AC impedance.

To find the numbers for voltage or amperage you can just move the numbers around assuming that you know at least three of the four numbers. If you needed to know the voltage you could divide the wattage by the amperage and then multiply it by the resistance...

God I miss high school.
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#9
10-29-2006
 talc micro ATX User Join Date: Oct 2006 Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts

I like that link as well GY. While not truly so, it is close to using the Socratic Method for teaching (which is very difficult with written material) which I think helps with retention of learned material. The others I listed are disertations, which can get rather dry. I like the sites that you listed because they have actual projects and circuits which helps to actually illustrate what you can do with the theory.
#10
11-12-2006
 ww2717 500W User Join Date: Nov 2006 Location: Main Satcom Facility Luna Moon Base Posts: 93 Thanks: 0 Thanked 0 Times in 0 Posts

can you explain LaPlace Transforms and Fourier analasyst.

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