This is a tough one. The symbol is a must for PSPICE simulation;
it is called “Ground” or “Circuit Common”.
It is a confusion that takes me years to get it right. For
beginner, just take it as all nodes connected to this symbol being electrically
joint up through wires – the trick is to acknowledge that wires are not perfect
conductor, they has resistance, inductance…
To give you a feel on how real world’s “Ground” connection
like, refer to the schematic diagram below – the black wires are the so called
“Ground”, and in diagram below “Star Ground” connection is being used, however,
this is usually not the case:
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