This simulation demonstrates how current flows through a resistor, inductor, and capacitor when driven by a square-wave voltage source with finite rise and fall times. The resistor current follows the waveform instantly because voltage and current stay in phase in a pure R. The inductor behaves differently: it resists sudden changes in current, so during each transition its current changes only slightly, but once the voltage becomes steady, the inductor current ramps up continuously. This is why