Learn electrical engineering by building
A hands-on course that starts with the physics of a single electron and never stops building: four course tiers, four specialization branches, and a growing shelf of real builds. Every lesson pairs theory with an interactive lab you can poke, drag and break — then a short quiz locks it in.
The Physics of Electricity
0/3Where charge comes from, what voltage really is, and what it means for current to flow — the foundation everything else stands on.
Electric Charge & the Atom
Everything electrical begins with a property of matter so fundamental we can only describe what it does: charge.
Voltage: Energy per Charge
Separating charges stores energy, like lifting a weight. Voltage measures how much energy every coulomb gets.
Current: Charge in Motion
Give charges a push and a path, and they flow. Current measures how much charge streams past per second.
Circuits & Ohm's Law
0/5Closed loops, the law that governs them, and the components that put electricity to work.
Your First Circuit
A battery, a lamp and a loop of wire — plus the two classic ways to get it wrong.
Ohm's Law
The single most useful equation in electronics: how voltage, current and resistance bind each other.
Resistors in Practice
The humble striped cylinder: why circuits are full of them, and how to read their colour code at a glance.
Power & Energy
Watts, joules, kilowatt-hours — where the energy goes, how fast it goes, and why components have ratings.
Series & Parallel
The two ways to wire anything — and the rules that let you collapse a network into one number.
Analyzing Circuits
0/4The conservation laws that crack any circuit, the divider trick you'll use forever, and the components that bend time.
Kirchhoff's Laws
Two statements of pure common sense — charge doesn't vanish, energy doesn't appear — that unlock every circuit ever built.
Voltage Dividers
Two resistors that turn any voltage into any smaller voltage — the most-reused pattern in electronics.
Capacitors & the RC Time Constant
A component that stores charge and, paired with a resistor, tells time. This lesson powers your final build's heartbeat.
Inductors & Electromagnetism
Coils store energy in magnetic fields, hate changes in current, and bite when interrupted. Also: how motors happen.
Semiconductors
0/3One-way valves, tiny amplifiers, and the legendary chip that ties the whole course together.
Diodes & LEDs
The one-way valve of electronics — and its glowing cousin that you must never connect without a resistor.
Transistors
A whisper of current controlling a shout — the amplifying switch that makes every modern machine possible.
The 555 Timer
Twenty-five transistors, eight pins, fifty years of blinking, beeping and timing — meet the chip you'll build with.
The Capstone Build
0/1Leave the simulator. Buy a handful of parts, wire a real 555 astable on a breadboard, and watch your own LED blink.
Progress & backup
this browser onlyProgress lives in this browser; sync keeps a server copy reachable only by your code, and exports are plain files you own. Imports and links always merge — nothing is overwritten.