Eleven self-contained experiments — from Ohm's law to graduate control systems and transistor biasing — in the Virtual Labs format. Each opens with an aim, the underlying theory and equations, a numbered procedure, a genuinely-computing interactive simulator, a marked self-assessment quiz and references. The engine is a hand-rolled Modified Nodal Analysis (MNA) solver with Gaussian elimination, implicit transient integrators, a complex-impedance AC sweep, a Durand-Kerner complex polynomial root finder, RK4 state-space step integration and large-signal device models — nothing is pre-baked.