Diarmuid Posted March 17, 2006 Report Share Posted March 17, 2006 Hi,I am looking for information, on how to calculate the resistance I need, for example If I had, the voltage I wanted to put in, and the voltage I wanted it to put out, how would I calculate the resistance needed?Thanks Diarmuid Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 17, 2006 Report Share Posted March 17, 2006 If the input voltage and the load's current never change (they nearly always change) then simply use Ohm's Law to calculate the resistance. Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 17, 2006 Report Share Posted March 17, 2006 Hi DiarmuidThen you have to learn Ohms Law! It goes like this: Quote Link to comment Share on other sites More sharing options...
Diarmuid Posted March 17, 2006 Author Report Share Posted March 17, 2006 Thanks for all your help so far.I am guessing that R, is resistance, but what do U and I stand for?Thanks very muchDiarmuid Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 18, 2006 Report Share Posted March 18, 2006 HiU stands for Voltage and I stands for Current, butDont you think its time to read a beginner's book about elektronics first?//Staigen Quote Link to comment Share on other sites More sharing options...
Diarmuid Posted March 18, 2006 Author Report Share Posted March 18, 2006 yeah, I suppose it is.I'll try and get one today, from amazon.thanks Diarmuid Quote Link to comment Share on other sites More sharing options...
Staigen Posted March 18, 2006 Report Share Posted March 18, 2006 Hi DiarmuidThere are already some good books here on this site, E-Books(PDF-files, some are RARed)!Look at the "Articles" area at the top of this side! Ante have uploaded some too,look in the "Electronic Resources" area here in the forum! They dont cost you a lot!//Staigen Quote Link to comment Share on other sites More sharing options...
MP Posted March 23, 2006 Report Share Posted March 23, 2006 Hi,I am looking for information, on how to calculate the resistance I need, for example If I had, the voltage I wanted to put in, and the voltage I wanted it to put out, how would I calculate the resistance needed?Thanks DiarmuidDiarmuid,From your post, it sounds as if you are looking for a resistive voltage divider.Here is a nice illustrated link that will explain how to do this.http://physics.mtsu.edu/~phys2020/Lectures/L12-L16/L13/Volt_Divider/volt_divider.htmlHope this helps.MP Quote Link to comment Share on other sites More sharing options...
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