Practical Electronics
Learn to build, test, and troubleshoot real working circuits from the ground up. Discover how everyday components like resistors, capacitors, and transistors direct electricity to power modern technology. Gain the confidence to read schematics, use a multimeter, and build your own hardware projects.
Like Duolingo, but for Practical Electronics. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
24 levels across 4 sections, about 48 minutes end to end, roughly 10 days at five minutes a day. It moves through Making Things Light Up, Steering and Storing Electricity, Diagnosing and Assembling, and Active Control and Logic. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Practical Electronics
- Electricity must flow in an unbroken loop from the power source through the component and back to ground/negative terminal to do work
- A disconnected wire creates an open circuit, which immediately stops all current flow
- A load (like an LED or resistor) limits current and converts electrical energy into light or motion
- Connecting positive directly to ground creates a short circuit, causing massive current, rapid heat buildup, and potential battery failure
- LEDs are polarized components that only allow current to flow in one direction
- The longer lead of an LED is the anode (positive) and must point toward the positive power supply to light up
- Plugging an LED backward blocks current flow without lighting up
- Breadboard tie-point rows share hidden metal clips running horizontally across groups of 5 pins
- Power rails run continuous vertical metal strips down each side to distribute voltage
- The center divider prevents the left and right sides from shorting together, perfect for bridging chips
- Low-voltage DC (typically 3V to 12V) cannot overcome human dry skin resistance, preventing lethal shock hazards
- Batteries provide direct current (DC), providing a steady reference voltage ideal for sensitive hobbyist components
- Household AC mains carry lethal high voltage (120V/230V) and alternating current that requires rigorous safety isolation
- LEDs offer very little internal resistance once powered, allowing dangerously high current to rush through
- A resistor throttles the current to a safe trickle that the LED can survive without overheating
- At a fixed voltage, higher resistance chokes the flow of electrical current
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Practical Electronics the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What happens if one wire in your working light circuit suddenly comes loose?
Get it right to open this lesson and 23 more in the app.
How to learn Practical Electronics, step by step
Go in order. 24 short levels across 4 sections, about 48 minutes in all, five minutes a day.
- 1
Making Things Light Up
- Building Your First Working Circuit
- Controlling Current with Resistors
- 2
Steering and Storing Electricity
- Directing Current with Switches and Diodes
- Buffering Power with Capacitors
- 3
Diagnosing and Assembling
- Finding Faults with a Multimeter
- Reading Schematics and Soldering
- 4
Active Control and Logic
- Switching Loads with Transistors
- Processing Signals with Integrated Circuits
4 sections · 8 units · 24 levels. Built to play, not to enroll.
Questions about Practical Electronics
How do I learn Practical Electronics?
Go in order: start with Making Things Light Up, then Steering and Storing Electricity, then Diagnosing and Assembling, then Active Control and Logic. On Tomo that's 24 short levels, about 48 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for Practical Electronics?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. Practical Electronics is one of its free courses, and you can type any other topic to get a course of your own.
Is the Practical Electronics course free?
Yes. Practical Electronics is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn Practical Electronics?
24 levels across 4 sections, about 48 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start Practical Electronics?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Practical Electronics is taught in the Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
More Technology on Tomo
Hands-On Electronics
Demystify how everyday gadgets work by building and understanding circuits from the ground up. Learn to direct electrical currents, wire components safely, and read circuit behaviors.
Building Your First Circuits
Demystify hardware by learning how real electricity behaves in wires, components, and boards. Move from lighting your first LED safely to switching power with transistors and diagnosing broken circuits with confidence.
How Electric Circuits Work
Learn how electricity moves through everyday devices and gain the confidence to build your own circuits. From breadboarding components to debugging with a multimeter, discover the practical rules that bring hardware to life.
How Electrical Circuits Work
Demystify electricity by building, measuring, and troubleshooting real circuits. Learn how voltage, current, and resistance interact to power everyday devices safely.
Electricity and Practical Circuits
Move beyond basic textbook formulas to build a working intuition for real circuits. Learn how components behave under load, diagnose tricky faults, and master the forces shaping electrical systems.
Everyday Electronics in Action
Discover how everyday gadgets really work by tracing the path of electricity through loops, resistors, capacitors, and switches. Build a practical mental model of basic circuits using real-world examples.
Start Practical Electronics today.
Download Tomo, search Practical Electronics, and play your first lesson in under a minute.