My Math Forum finding unknown value in equality

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May 13th, 2015, 06:53 AM   #1
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finding unknown value in equality

Hi. someone may explain me how to find Lr value in the equality is it possible ?>>see image
without knowing " Lr " cant even find 55sqrt2, so seems like a 2unknown system is needed , but i cant figure how to.the other quantity are well known.any help appreciated.Tvm Henry. last line says from this equation Lr = 2.25mH, yes but how to find it?
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Last edited by e21959; May 13th, 2015 at 07:38 AM.

 May 13th, 2015, 07:04 AM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 "You must return when the moon has friends and the fox is borrowed." ???????
 May 13th, 2015, 08:17 AM #3 Newbie   Joined: Mar 2012 Posts: 8 Thanks: 0 . hi am i trying to find something is not possible to find or am i blind ? is your a riddle?tvm
 May 13th, 2015, 08:44 AM #4 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 That was what I was getting when clicking on your link.
May 15th, 2015, 06:03 PM   #5
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finding unknow value

Hi. Denis i wrote this because that day i posted here was totally screwed up
That value 55Volts of the lamp you see in the equation was specified in lamp specification parameters, so was a well known value,in the equation then it was multiplied by sqrt2 to get lamp_peak voltage (55 Volt is RMS voltage), and knowing that now it is really easy find Lr value.Tvm for all . Henry
Solved!
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 May 15th, 2015, 07:01 PM #6 Math Team     Joined: May 2013 From: The Astral plane Posts: 2,258 Thanks: 929 Math Focus: Wibbly wobbly timey-wimey stuff. What's with the "Do not distribute" stuff? -Dan
 May 16th, 2015, 05:16 PM #7 Newbie   Joined: Mar 2012 Posts: 8 Thanks: 0

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### find unknows equality

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