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formula rearranging

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gjpollitt

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Using voltage divider formula

ie Vout = Vin * R1 / R1+R2

How do you rearrange this to find the value of R2?

ie Vin is 9v, Vout is 5v, R1 is 1k

thanks
Graham
 
R2 = R1(Vin - Vout)/Vout
 
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