
Re: capacitor equation solution not working
Posted:
Jun 17, 2011 5:06 AM


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<10t>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

