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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I've never heard of a samulation program; do you mean a simulation program?
Yes, it's probably just the simulation program that requires a ground but any well-drawn schematic should have a 0V rail or ground connection clearly marked.
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for the same reason a tape measure has numbers printed on it