Previous in Forum: seminar   Next in Forum: Wattmetric protection in main High Voltage supply
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
5 comments
Rate Comments: Nested
keith_moc@yahoo.com
Member

Join Date: Jan 2008
Posts: 9

Answer to formula (1-r1/r2) Explained

01/19/2008 3:06 AM

OHM's Law can be used for calculating the current through the LED for a range of resistance values.R1=100 Ohms.LED current=.043vThe formula for current is I=V/R.An LED doesn't begin to conduct untill forward voltage is 1.7 volts(red LED).Therefore the formula for current is I=(6v-1.7v)/R or risistance.Which Can be found In Radio Shacks book,"Electronic Formulas, Symbols and Circuits".Thank You,

By D.w.Howerton

Scientist/Electrician/Electronics Teck.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Electroman
Guru
United Kingdom - Member - Olde Member!! Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jul 2006
Location: Dunstable, England
Posts: 2821
Good Answers: 45
#1

Re: Answer to formula (1-r1/r2) Explained

01/19/2008 9:06 AM

Hmmmm a simplified version, but who are you answering? Or are you expecting a debate?

John.

__________________
 A little knowledge is a dangerous thing - Googling is far worse!
Register to Reply Score 1 for Off Topic
Vulcan
Guru
Philippines - Member - New Member Engineering Fields - Instrumentation Engineering - New Member Engineering Fields - Control Engineering - Who am I?

Join Date: Oct 2006
Location: Northern Mindanao, Philippines
Posts: 2147
Good Answers: 53
#2
In reply to #1

Re: Answer to formula (1-r1/r2) Explained

01/20/2008 4:44 AM

I think his title is referring to this thread:

http://cr4.globalspec.com/thread/16556#newcomments

However, the rest of his post seems to answering some other thread or post. Even though, it doesn't make sense. Too bad there's no bad answer score .

__________________
 Miscommunication: when what people heard you say differs from what you said. Make yourself understood.
Register to Reply
nesubra
Guru

Join Date: Nov 2006
Posts: 729
Good Answers: 2
#3

Re: Answer to formula (1-r1/r2) Explained

01/20/2008 7:57 AM

any how thanks for the information though i am not able to relate to a particular post/thread

__________________
 To avoid crticism do nothing,say nothing,be nothing
Register to Reply
JohnDG
Guru
United Kingdom - Member - Not a New Member Hobbies - Musician - New Member Hobbies - Fishing - New Member

Join Date: May 2006
Location: Reading, Berkshire, UK. Going under cover.
Posts: 9684
Good Answers: 468
#4

Re: Answer to formula (1-r1/r2) Explained

01/20/2008 12:18 PM

Is that D.W. Howerton, the renowned facial reconstructive surgeon?

__________________
 "Love justice, you who rule the world" - Dante Alighieri
Register to Reply Score 1 for Off Topic
Sparkstation
Guru
New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

Join Date: Nov 2007
Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#5
In reply to #4

Re: Answer to formula (1-r1/r2) Explained

01/20/2008 3:49 PM

No, JohnDG

Refer: <"By D.w.Howerton

Scientist/Electrician/Electronics Teck.">

I'm unsure why the second name has a small 'w', it may be something like the 'd' in French, or the 'van' in Dutch.

Teck is a word with multiple meanings, from a Chinese surname, City in Germany etc.

Google Search terms: teck meaning (Unbolded, of course) should give you varied examples, if you wanted to know more.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
Register to Reply
Register to Reply
Have a Different Question?
5 comments
Copy to Clipboard

Users who posted comments:

Electroman (1); JohnDG (1); nesubra (1); Sparkstation (1); Vulcan (1)

Previous in Forum: seminar   Next in Forum: Wattmetric protection in main High Voltage supply

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (158 right now)
Show Members
Advertisement