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The old-fashioned way is to draw your circuit on a piece of paper and label the nodes.

Comsol does not support schematic capture. You can download free SPICE variants that do schematic capture. Comsol can import a SPICE netlist.

Dave, I appreciate your quick reply.

I need to do more practice then to understand how to understand which node is connected to which node. my circuit is not that complex.

Let's then propose this question as well. Let's imagine I have two separate piezoelectric layers. They are creating voltage. on the electrostatic -> ground : I have boudaries 1, 2 on the electrostatic -> terminal : I have boundaries 3, 4.

My circuit is comprised of : Ground node, resistor , and external terminal. The ground node is p on node 0 The resistor is p on node 1 and n on node 0 The external ternal uses the same node as in electrostatic.

what will be the configuration to connect them in series and parallel? Do I need to swap boudaries on electrostatic?

Ok, Here is a rough schematic of what I am trying to do. (please see attachments)

I understood, since I had 2 bodies but only 1 solid mechanics and 1 electrostatic physics, they were not each working separatly. I made them two separate physics like * solid mechanic1 * electrostatic1 * solid mechanic2 * electrostatic2 * and then * 1 electric circuit.

Would someone please confirm if this is how I should do it?

Thanks.