The concept library

Learn a concept in minutes.

Short, hands-on courses on how things actually work — from Ohm's law to logic gates to the atom. Tap any card to start. No account needed.

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Electrical Engineering

Circuits, components, logic, and the physics that powers them.

Voltage, current, resistance, and Ohm's law — the whole foundation

Resistors, capacitors, diodes and transistors — what each part actually does

From binary bits to logic gates to a working computer

How electricity and magnetism power motors and generators

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The building blocks of matter and the rules that move it.

Protons, neutrons, electrons — and why they explain chemistry

Newton's laws and the ideas behind everything that moves