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## Re: Resistors in Parallel..... tabulated?

 Subject: Re: Resistors in Parallel..... tabulated? John Larkin Mon, 01 Jan 2007 17:01:03 -0800 sci.electronics.basics
 ```On Mon, 01 Jan 2007 19:48:15 -0500, Jamie <[email protected]/* */> wrote: >kontiki wrote: > >> kontiki wrote: >> >> >>>Hi, does anyone know where a reference table of parallel resistors >>>could be found?The table is very useful for quick accurate resultant >>>resistances (to two places of decimal), the tables I've got are from >>>Practical Electronics Jan. 1990? and have faded to the point of being >>>unusable.Most non-standard resistance values are easily ascertained >>> e.g.for 17 ohms->75//22 >>>quickly and easily! >>> with thanks, >> >> >> >> thank you for your replies....the "math" is fine,.... >> lets say I want to shunt a 120k res. to get a >> 15.6k how long does it take to find the required value? a table is much >> faster ,and if you are limited by values "at hand" again an alternative >> pair is easily/quickly chosen.This is useful for establishing the >> practical effects of temperature compensating resistors and >> thermistors. >> I tend not to fire up the pc each time I need to do the math... >> >2 ways. >You just reverse the standard method.. > >(120K*15.6K)/(120K-15.6K) = 17.931K which is what you need. > >Personally i like this one. >1/(1/15.6K- 1/120k) = 17931; > > I can hit the inverse( reciprocal ) key on me calculator at the >end instead of starting it off with a 1/(... , this saves in a 2 key >strokes. RPN: 15.6 1/x 120 1/x - 1/x ```
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