Software, Superposition Theorem and Source Transformations

Today in E44:

I had a bunch of coffee given to me this week.  I wanted to share the caffeine, so I brought my coffee gear to class, and made coffee for the team.  They were pretty stoked, and I should have taken pictures.  I hope this will suffice to deliver the full range of their emotions:
😀😁😃
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the team.
In class, we spent the first hour talking about a program to model circuits.  It's basically SPICE online.  It did a great graphical representation of the currents and voltages across circuit components. See: everycircuit.com.

We did a thing with superposition Theorem.  I've done a bit with the SP theorem, so it was pretty easy.  More interesting was the source transformation that Prof Mason introduced.  Apparently it is mathematically equivalent to compare current source with a resistor in parallel and a voltage source with a resistor in series. Mason did a good example of this in class, and I'm sure I'll get some homework practice.

LAB:
Our lab today was to practice the Superposition Theorem.  We had a simple circuit with two voltage sources.
An aside: The math for superposition theorem isn't hard, but we spent a good deal of time fiddling with the Discovery scope.  I'm coming to despise the discovery scope, and its way of coming loose in the breadboard, and having the wires I plug into it fall out.  In the future, I might test everything for voltage before I plug it in.

Our measured currents eventually got close enough to our calculated currents.  We rejoiced, and retired for the day.  Lo, behold our glorious measurements of sufficiently small inaccuracy to be considered acceptable:
Table, as requested by lab manual with measured/expected values for 3V,5V, both, and percent difference:

I hear your voice.  No not your voice, but the one that brushes up against your consciousness with a song of sweet, familiar whispers and questions of what you might eat in a few hours.  But now, poised to strike, the voice summons a question: "Thor you dingus. That picture doesn't include your theoretical to measured errors! What is the percent error between your theoretical and measured?!"

Ey o here ya go:
6% for the resistor connected to 3V
6.5% for the resistor connected only to 5V
3% total

Note that my error goes down as the numbers get bigger. Hooray for proportionality and the law of large numbers.