World 1 · Electricity basics
Copper Flats
Charge, voltage, current, resistance, Ohm's law and power. Light your first LED.
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Voltage: the push40 XP · 6 min
Current: the flow40 XP · 6 min
Resistance: the squeeze50 XP · 7 min
Ohm's law60 XP · 8 min
Power and heat60 XP · 8 min
Project: Pocket Flashlight120 XP · 12 min
World 2 · Series, parallel & Kirchhoff
Junction City
Combine resistors, divide voltages, and follow every electron with Kirchhoff's laws.
Series circuits Parallel circuits Voltage dividers Kirchhoff's current law Kirchhoff's voltage law Project: Battery Gauge
World 3 · Capacitors, inductors, RC & RL
Capacitor Caves
Store energy in fields and watch voltages rise and fall over time.
Capacitors RC charging Inductors Project: Blinking LED Timer
World 4 · AC fundamentals
Oscillation Coast
Sine waves, frequency, impedance and your first filters.
Sine waves Impedance Basic filters Project: Bass & Treble Filter
World 5 · Semiconductors
Silicon Ridge
Diodes, LEDs up close, and transistors as switches.
Diodes Transistors as switches Project: Light-Sensing Night Light
World 6 · Op-amps
Amplifier Peaks
Comparators, followers and amplifiers built from one tiny chip.
Meet the op-amp Inverting & non-inverting Project: Microphone Preamp
World 7 · Digital logic
Logic Grid
Gates, truth tables, flip-flops and counters.
Logic gates Flip-flops Project: Logic-Gate Adder
World 8 · Microcontrollers intro
The Core
Pins, code and timing on a simulated Arduino-style board.
What's a microcontroller? Project: Traffic Light