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capacitor equation solution not working

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  capacitor equation solution not working "J and B" <noslowski@comcast.net> - 2011-06-17 04:09 +0000
    Re: capacitor equation solution not working "Nasser M. Abbasi" <nma@12000.org> - 2011-06-17 09:52 +0000

#3142 — capacitor equation solution not working

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}]

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#3162

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

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