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ground in ac

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fedail

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why i should to put ground element to this circuit to work as good
 

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Because most simulation programs require a ground in a circuit as a reference to calculate all the voltages and currents from.
 
thanx for ur quick answer but i still not understand

is it just for samulation program not in real life
and how the samulation program calculate the voltage and current from the ground
 
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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