SOLUTION: hi I have been trying to transpose a formula for some time with very little success. is there any chance you could help with finding t in the following equation; vc = v(1-e^(

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Question 930855: hi
I have been trying to transpose a formula for some time with very little success. is there any chance you could help with finding t in the following equation;
vc = v(1-e^(-t/CR))
Many thanks
Jack

Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
vc = v(1-e^(-t/CR))
vc = v -ve^(-t/CR)
ve^(-t/CR) = v - vc
e^(-t/CR) = (v - vc) / v
e^(-t/CR) = 1-c
use logarithm rule
-t/CR = ln (1-c)
t = -CR * ln(1-c)

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