22 Core Concepts
Before building, you need to know what the pieces are. Each concept is a short 1–2 minute video — one idea, explained simply with a real-life analogy.
What is Electricity?
The invisible force that powers everything around you. We'll discover what electrons are, why they move, and what that movement actually means.
What is Voltage?
The pressure that pushes electricity through a wire. Measured in Volts — from a 1.5V battery to a 220V wall socket.
What is Current?
How much electricity actually flows through a wire each second. Measured in Amperes — the quantity, not the force.
What is Resistance?
The thing that slows electricity down. Measured in Ohms. V = I × R — Ohm's Law ties all three together.
What is a Resistor?
A component whose entire job is adding a specific amount of resistance. Those colored stripes? They're a code that tells you exactly how many Ohms.
What is a Diode?
A component that only allows electricity to flow in one direction. The right way — current flows. Backwards — nothing happens.
What is an LED?
Light Emitting Diode — a special diode that produces light when current flows through it. In your Robotik kit you have four colors. They're the first thing you'll bring to life.
What is a Capacitor?
Stores electrical energy and releases it in a burst. Unlike a battery, it charges and discharges in milliseconds.
What is a Transistor?
The most important invention of the 20th century. It's a switch and an amplifier in one tiny package — and your phone has billions of them. A small signal controls a much larger one.
What is a Microcontroller?
A tiny computer on a chip. It has a processor, memory, and — most importantly — pins that connect to the physical world. Read inputs. Control outputs. That's engineering thinking.
What is an Electron?
The fundamental particle that carries electric charge. Everything in electricity comes down to electrons moving through materials.
What is a Conductor?
A material that allows electrons to move freely. Metals like copper are excellent conductors, which is why wires are made from them.
What is an Insulator?
A material that resists the flow of electrons. It prevents electricity from going where it shouldn’t.
What is Electrical Isolation?
The practice of separating parts of a circuit so that electricity cannot flow between them unintentionally. It’s critical for safety and signal integrity.
What is a Battery?
A device that stores chemical energy and converts it into electrical energy, providing voltage to power circuits.
What is an Arduino Board?
A beginner-friendly microcontroller board that lets you build real electronic projects. Write code, upload it, and watch your circuit come alive.
What is a Switch?
A device that opens or closes a circuit. When closed, current flows. When open, it stops completely.
What is a Circuit?
A complete path that allows electricity to flow. Without a closed loop, nothing works.
What is Transconductance?
A measure of how effectively a device (like a transistor) converts a change in voltage into a change in current. It’s key to amplification.
What is Frequency?
How often a signal repeats per second. Measured in Hertz (Hz). Important for signals, clocks, and communication.
What is a Signal?
A changing electrical value (voltage or current) that carries information. Everything from buttons to Wi-Fi is based on signals.