# Capacitor Discharge Time Formula Euler!

1. Apr 8, 2016

### NickTesla

I would like to understand how the Euler constant elevated to fractional exponent gave this result? 958mV someone please!?

2. Apr 8, 2016

### Svein

You did not give enough information for us to check everything, but the calculation is correct (I checked it on my old HP calculator).

3. Apr 8, 2016

### NickTesla

It is because my doubt is the fractional exponent, do not know why has this result!

4. Apr 8, 2016

### NickTesla

Personal My question is in Euler's constant raised to a fractional exponent!
Why and how ?? I do not know calculate HP, it's good we mastered without having to use HP,

I have a teaching video, but honestly I still do not understand if you want to see the video? I have!

Last edited: Apr 8, 2016
5. Apr 8, 2016

### cnh1995

Charging of a capacitor is an exponential
event. Voltage across capacitor rises exponentially as
Vc=Vf(1-e-t/T). Time t is in the exponent, hence the part e-t/T is responsible for the exponential increase in voltage w.r.t time.

6. Apr 8, 2016

### Svein

OK. Let us take it in steps:
1. $\frac{10}{47}= 0.212765957$
2. $e^{-0.212765957}=0.808345302$
3. $1- 0.808345302=0.191655$
4. $5 \cdot 0.191655 = 0.958273$

7. Apr 8, 2016

### NickTesla

Yes! , I understand, but using numbers,
Watch this video!

8. Apr 8, 2016

9. Apr 8, 2016

### NickTesla

10. Apr 8, 2016

### NickTesla

Sven Wonderfully Thank you!

11. Apr 8, 2016

### NickTesla

12. Apr 10, 2016

### NickTesla

Personally, I'll be honest, here in South America (Brazil) I doubt that the Brazilian has a video explaining speaking Neper calculation on youtube to calculate the potentiation, constant = e ^ -0.212765957,
I doubt (I dúvi [do] D + O = DO = DEODO talking!). Kkk! I doubt DEODO is when we doubt very much! is the Brazilian way of speaking! My God there are only understand potentiation, that's all, and I going crazy, studying (Mantissa) studies (Mantissa) kkkk lol (mathematics: decimal part of a logarithm) !
(Matematicas: decimal part of a logarithm)! I wanted the help of North America, if possible help from the American continent LOL kkkk