of circuit resolution, which comes down to measuring voltages with
respect to a reference node and thus simplifies calculations.
Turns out that it is this method which is used by online circuit
simulators such as SPICE, because it easily lends itself to coding.
So I tried for a long time to get a simulator to give me the results of the
Khan example (and never did get Circuit lab to do so). I did learn something,
though, and it is that the direction of the arrow on an ideal current source matters.
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