Date: Jun 17, 2011 5:06 AM
Author: Nasser Abbasi
Subject: Re: capacitor equation solution not working
On 6/16/2011 9:09 PM, J and B wrote:

> I am trying to solve a very simple circuit, one that has only a capacitor in

> it. What am I doing wrong? The final graph should show that the capacitor

> has discharged, but its staying constant. I have current starting at t=10

> and ending at t=60.

> I hope I have used the correct way to put in my code, I am using a new

> computer and I having trouble with my email program. Any advice would be

> appreciated.

>

> Thanks

>

> My code.

> I[t_]:= If[t<10||t>60,0,1]

> Plot[i[t],{t,0,100}]

> Eq=v'[t]==i[t]/c

> c=1;

> Soleq==v[t]/.NDSolve[{eq,v[0]==0},v[t],{t,0,100}],[[1]]

> Plot[soleq,{t,0,100}]

Mathematica is case senstive. Try this:

----------------

f[t_] := If[t < 10 || t > 60, 0, 1]

Plot[f[t], {t, 0, 100}]

eq = v'[t] == f[t]/c

c = 1;

soleq = v[t] /. First[NDSolve[{eq, v[0] == 0}, v, {t, 0, 100}]]

Plot[soleq, {t, 0, 100}]

----------------

--Nasser