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# Re: Need a calculator that knows about coulombs

```On Tue, Dec 29, 2015 at 6:12 PM, Gene Heskett <gheskett@shentel.net> wrote:
>
> A paste of what I entered:
>
> define vc(vs,t,r,c) {
> return vs * (1-e(-t/(r*c)))
> }
> for ( i=0.0; i<5.0; i += 0.1 ) { print i, ":", vc(120,i,83,.01 ),"\n" } 0:0

Sorry I missed that. Probably should stay off the list when I'm in a
hurry. Rip the 0:0 off the end and see how that works:

for ( i=0.0; i<5.0; i += 0.1 ) { print i, ":", vc(120,i,83,.01 ),"\n" }

Or you could unpack it  bit:

for ( i=0.0; i<5.0; i += 0.1 ) {
print i, ":", vc(120,i,83,.01 ),"\n"
}

The units should be volts, seconds, ohms, and farads. I'm not positive
about farads, but the units were set up so that this equation would
work without conversion, as I recall.

Adding current and power should look something like

scale=5;
vs = 120;
r = 100000;
c = .00001;
for ( t=0.0; t<5.0; t += 0.1 ) {
vr = vs - vc;
a = vr / r;
p = vr * a;
print"t: ", t, "  vc:", vc(vs,t,r,c ), "  a: ", a, "  p: ", p,  "\n"
}

--
Joel Rees

Be careful when you look at conspiracy.
Arm yourself with knowledge of yourself, as well:
http://reiisi.blogspot.jp/2011/10/conspiracy-theories.html

```

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