In the figure-1 what is the point of connecting wires to earth? Can we connect all these earthed wires together as in figure-2? (that will make more sense)
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\$\begingroup\$ Safety. If a ground fault occurs, circuit protection will activate. \$\endgroup\$– StainlessSteelRatCommented Jun 14, 2017 at 14:38
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1\$\begingroup\$ Although that symbol looks like an earth symbol it is very rare in electronics that it really means "earth" (or mains earth). It simply means that all similar symbols are connected together as you have shown with the red line. \$\endgroup\$– Steve GCommented Jun 14, 2017 at 14:41
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All like ground symbols are connected together. That is the point of the symbol -- to indicate all of the nodes that are connected to ground. It simply cleans up the schematic because it prevents wires from being shown across the entire schematic.
All identical ground symbols indicate the same node.
answered Jun 14, 2017 at 14:39
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\$\begingroup\$ It is important to note that the schematic shows a mains safety 'Earth' symbol. It does not mean that the symbols are simply connected together ....it means that plus they are connected to the mains earth. \$\endgroup\$ Commented Jun 14, 2017 at 15:29
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\$\begingroup\$ @JackCreasey Of course, the node is defined as earth ground, so obviously it should be connected as such. I thought that was implied. My point is that electrically, all of the ground symbols are connected to the same earth ground. \$\endgroup\$ Commented Jun 14, 2017 at 15:49
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\$\begingroup\$ There is no indication the op understands the difference between safety grounded or not. \$\endgroup\$ Commented Jun 14, 2017 at 15:58
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\$\begingroup\$ Fair enough, that is definitely important for him to understand when playing with this sort of circuit. \$\endgroup\$ Commented Jun 14, 2017 at 16:37
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\$\begingroup\$ Tell me i understood correctly or not, here earth acts as single wire, to which all nodes are connected? I also liked the comment of Steve G. \$\endgroup\$ Commented Jun 14, 2017 at 19:09