How do you think these circuits work?

Welcome @alyan231213 ! thanks for joining our community, there are two modes of simulation, offline and online. For offline mode behind the scenes we use algorithms to calculate current, voltage and ohm via matrixes, check this useful link to see what it takes to calculate results https://aice.sjtu.edu.cn/msda/data/courseware/SPICE/lect07_element_stamping.pdf

For the online mode, we build a netlist when using NGSpice option by which the circuit can be processed at cloud using NGpsice library.

NGSpice option:
Screen Shot 2023-01-01 at 9.53.48 PM

For information about NGspice library, check out https://ngspice.sourceforge.io/

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