Yellow +/- show the polarity when element voltage is positive. They can be arbitrary, as long as current arrows point from + to. To properly analyze the circuit, we must fix our convention of voltage polarities across elements (voltage source, resistors, inductor and capacitor) and current directions through elements. This tutorial shows analytical way of solving the same problem. The problem though, is that huge number of steps are needed, and it consumes a lot of CPU time to get the results. One way to do this kind of simulation, is to do it in small time steps, and assume that all voltages and currents behave linearly between the steps. From the simulation results, we can see that the output waveform is definitely not trivial (voltage of net_b and current of C1 showed). This circuit, just an example, has known voltage feed (V(net_a)from voltage source (V1), and our interest is to know the voltage output (V(net_b)).
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