GND (ground)

The 0 V reference every other part on the canvas measures against.

gnd is vcc's other half: one pin, always 0 V, and every voltage anywhere in the circuit is relative to whatever net a gnd part is on.

Pins

Pin	What it does
GND	Drives whatever net it is on to 0 V.

Properties

None. Ground is ground.

What the model gets right

Ground behaves the way a real ground plane does: low impedance, and anything referenced to it reads the voltage it should. A circuit with several gnd symbols on the canvas is the same net once they are wired together, exactly as a schematic's ground symbols are shorthand for one rail.

What it does not model

No ground bounce, no resistance in the return path. A real PCB's ground plane has a little impedance and a lot of current through it can move the "zero" a few millivolts; Mokxi's ground never moves. Nor does a wire have any resistance or inductance anywhere on the canvas, so a long thin return path costs nothing and a star-ground lesson has nothing to teach here.

Common mistakes

Forgetting it. A sensor or a chip with power but no ground reference reads Floating or Unknown rather than the sensible value a beginner expects, which is the model's way of saying the circuit is not actually complete yet. See how parts are modeled for what Floating and Unknown mean.

See it in action

Ground is in nearly every template on /templates; Hello, breadboard is the simplest place to see the whole loop, source to load to ground, in one glance.