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**Please Help!**

This is based on the time at any point on the curve during exponential decay of voltage.

Could someone explain to me this formula?

t=T1n(E/Vl)

example:

t=(7.5ms)1n(20v/14.57v)=2.38ms.

I get 20/14.57=1.372683596

(7.5)(1.372683596)=10.29512697

where and how do you get 2.38, where does the 1n fall in and how? is there a numerical value for this statement? Please help?