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How do you find the time constant and the value of C when you know values of R and half-time?
Wiki User
∙ 13y ago
If 'T' = time constant and half-time = 'H', then 0.5 = e-H/T .
When you MASH that around a bit, you find that
Time-constant = -(half-time) / ln(0.5) = approx. 1.4427 x half-time (rounded)
Then, knowing the time-constant, you also know that it's equal to RC ,
and since you know 'R', then
[ C = time-constant / R ] .
After all these years, I still sometimes amaze myself.
Wiki User
∙ 13y ago
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