Yang Hawk wrote:
> have a question about why my current flow is negative:
> my circuit net list here:
> diode
> vs 1 0 dc 1v
> d1 1 0 dnorm
> .dc vs -0.8v 0.7v 0.004v
> .model dnorm d(is=1e-14)
> .probe
> .end
>
> and in ngspice, I execute,
> plot i(vs)
>
> the plot graph is shown that the current is negative
>
> I find the answer from ngspice/spice3f5 user's manual:
> I(VXXXXXXX)
>
> specifies the current flowing in the independent voltage source named
> VXXXXXXX. Positive current flows from the positive node, through the
> source, to the negative node. For the ac analysis, the corresponding
> replacements for the letter I may be made in the same way as described
> for voltage outputs.
>
>
> so, no doubt, the current is negative. But why the spice is so designed?
>
why not?
> and How could I check current between any two nodes?
I'm assuming you mean "how could I check current in any branch". You
can insert a zero volt DC voltage source in any branch and monitor the
current through it.
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