Circuits & Digital Systems
An intuitive, interactive Circuit Analysis and Digital Logic course covering the topics typical of the first two years of an electrical engineering degree. Every lesson pairs plain-language explanations with precise circuit diagrams, worked examples, hands-on simulations, and practice you can check yourself.
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Foundations of Circuit Analysis
Charge, current, voltage, and Kirchhoff's laws — the toolkit every later module builds on.
Nodal & Mesh Analysis
Systematic methods for solving any resistive network — node voltages and mesh currents.
Network Theorems
Thévenin, Norton, superposition, and maximum power transfer for linear networks.
Op-Amps & Active Circuits
Dependent sources and the ideal op-amp model, applied to real amplifier configurations.
Capacitors & Inductors
Energy-storing elements, their series/parallel combinations, and the principle of duality.
- Capacitor Fundamentals & V-I Relationship 16 min · soon
- Inductor Fundamentals & V-I Relationship 16 min · soon
- Energy Storage in Capacitors & Inductors 12 min · soon
- Series & Parallel Combinations 14 min · soon
- Duality in CircuitsOptional 12 min · soon
First-Order Transients
Natural and step responses of RC and RL circuits — the general first-order method.
- RC Natural Response 18 min · soon
- RL Natural Response 16 min · soon
- RC Step Response 16 min · soon
- RL Step Response 14 min · soon
- General First-Order Method 18 min · soon
Second-Order Transients
Natural and step responses of series and parallel RLC circuits, across all damping regimes.
- Series RLC Natural Response 18 min · soon
- Parallel RLC Natural Response 18 min · soon
- Overdamped, Underdamped & Critically Damped Cases 16 min · soon
- Second-Order Step Response 18 min · soon
- Damping Ratio & Natural Frequency 14 min · soon
AC Steady-State & Phasors
Sinusoidal analysis using phasors, impedance, and phasor-domain network methods.
- Sinusoidal Sources & Parameters 12 min · soon
- Phasor Representation 16 min · soon
- Impedance & Admittance 16 min · soon
- Nodal & Mesh Analysis in AC 18 min · soon
- Network Theorems in AC 16 min · soon
- Phasor DiagramsOptional 14 min · soon
AC Power Analysis
Real, reactive, and complex power, RMS values, and power factor correction.
- Instantaneous & Average Power 14 min · soon
- RMS Values 12 min · soon
- Complex Power & Power Triangle 16 min · soon
- Power Factor & Correction 16 min · soon
- Maximum Power Transfer in ACOptional 14 min · soon
Frequency Response & Filters
Transfer functions, Bode plots, passive filter topologies, and resonance.
- Transfer Functions 16 min · soon
- Bode Plots 20 min · soon
- First-Order RC/RL Filters 16 min · soon
- Second-Order Active & Passive Filters 18 min · soon
- Low-Pass, High-Pass, Band-Pass & Band-Stop 16 min · soon
- Series & Parallel ResonanceOptional 16 min · soon
Digital Logic Foundations
Number systems, Boolean algebra, logic gates, and simplification methods.
- Number Systems & Conversions 14 min · soon
- Boolean Algebra 16 min · soon
- Logic Gates & Truth Tables 16 min · soon
- Karnaugh Maps 18 min · soon
- SOP, POS & Standard Logic Forms 14 min · soon
Combinational & Sequential Logic
Building blocks of digital systems, from adders to flip-flops, counters, and registers.
- Adders & Subtractors 16 min · soon
- Multiplexers & Decoders 16 min · soon
- Latches & Flip-Flops 18 min · soon
- Synchronous & Asynchronous Counters 16 min · soon
- Shift Registers & Intro to State MachinesOptional 18 min · soon
New lessons are added continuously. Prefer to test yourself? Try the Electrical Aptitude test.