
Home  Forums  Rules  Articles  diyAudio Store  Blogs  Gallery  Wiki  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
Everything Else Anything related to audio / video / electronics etc) BUT remember we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools...... 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
20th March 2007, 12:05 AM  #1 
diyAudio Member
Join Date: Oct 2004

Math by armbar
I have no option but to concede defeat.
Some math wiz here that can explain what "A//B" is? It is supposed to means A divided by B in parallel. The real question for me is, how do I type it in my graphing calculator? 
20th March 2007, 12:13 AM  #2  
diyAudio Moderator

Re: Math by armbar
Quote:
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff? 

20th March 2007, 12:23 AM  #3  
diyAudio Member
Join Date: Oct 2004

Quote:
Thinking about it, I'm not quite sure where I got what I wrote in my original post. I blame tired head and eyes after hours of reading and rereading. 

20th March 2007, 10:36 AM  #4 
diyAudio Member
Join Date: Oct 2004

Solved it.
X=1/((1/A)+(1/B)) Too tired to think last night, I guess. I solved it by trying to think of some similar equation I might have done in the past. I don't have a clue about what it means. But, as said, I only have to know how to type it in my calculator. phn by painful heel lock. 
20th March 2007, 04:08 PM  #5 
diyAudio Member
Join Date: Oct 2004

Doh!
Not long after I left home did it hit me. It calculates paralleled resistors. I knew that. You use it to set the load for MC carts. 
20th March 2007, 06:16 PM  #6  
diyAudio Member
Join Date: Jan 2005
Location: Phoenix, Az.

Quote:
The formula full of reciprocals of reciprocals is good if you have three or more items connected in parallel. For just two it is usually easier to remember and calculate A*B/(A+B). I_F 

20th March 2007, 10:12 PM  #7 
diyAudio Member
Join Date: Oct 2004

The engineer in you speaking, eh?
And here I was all happy having solved it on my own. Not bad, I think, considering I have forgot, if not everything, 95 pct of what I learned in high school. I think and hope this is HS level. But then, I probably have forgotten 95 pct of everything I learned in school. Thinking about it, I don't know what I learned in school other than being quite and feeling shame if you didn't. Man, what a hellhole it was. 
21st March 2007, 02:18 AM  #8 
diyAudio Member
Join Date: Feb 2007
Location: Lake Tahoe, NV

If phn's calculator has a reciprocal function key (say "1/X" or x^1); then the reciprocals of reciprocals is less keystrokes than the reciprocal of the LCD (least common denominator, A*B) form for 2 resistors even if A and B are only 1 digit each. You would enter: A, rec key, +, B, rec key, equal key, rec key
Also the reciprocal of the reciprocal form allows you to do a problem like: I need two resistors in parallel to make 10K and I have a 22K resistor, what do I need? => 1/((1/10K)(1/22K)), without breaking a sweat! The form A // B => A*B/(A+B), should never be taught; as it has no intuitive connection to conductance => 1/resistance which is at the heart of combining resistors in parallel and understanding how to calculate the answer in general. Just an observation and opinion, all correct answers are equivalent! VSR 
21st March 2007, 06:17 AM  #9  
frugalphile(tm)
diyAudio Moderator

Re: Math by armbar
Quote:
1/x = 1/A + 1/B as per your formula... dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 

21st March 2007, 06:19 AM  #10  
frugalphile(tm)
diyAudio Moderator

Quote:
A, 1/x, B. 1/x + 1/x dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Son of Zen and math  bertjan  Pass Labs  57  15th April 2016 04:57 PM 
math problem ??  prorms  Solid State  8  19th December 2006 09:48 PM 
Check my math?  Jalex420  Chip Amps  18  3rd June 2006 09:58 AM 
Can't do the math!  poorstudent  Full Range  3  22nd November 2005 07:37 AM 
Need some Math Help...  ctardi  The Lounge  3  21st June 2005 06:11 PM 
New To Site?  Need Help? 