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.
Like Duolingo, but for Electricity and Practical Circuits. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
22 levels across 3 sections, about 44 minutes end to end, roughly 9 days at five minutes a day. It moves through Reading and Taming the Circuit, Active and Reactive Components, and System Dynamics and Power Distribution. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in Electricity and Practical Circuits
- Voltage measures potential difference between two specific probe tips
- A positive rail reference subtracts that rail potential from the test point
- Chassis ground is an arbitrary zero reference rather than an absolute baseline
- Current measurements require breaking open the circuit path in series
- Voltage measurements rely on high input impedance to avoid siphoning current
- Ammeters present a dead short and instantly pop internal fuses across power rails
- A voltmeter forms an unintended parallel resistive branch with the circuit
- Meter burden alters sensitive high-impedance nodes during active measurement
- Source resistance must be significantly lower than meter impedance for accuracy
- Conductors should drop negligible voltage under standard current flow
- Unexpected voltage drop isolates localized high-resistance flaws like corrosion
- Voltage drops only appear across resistance while active current is flowing
- An open break blocks all current and shows full supply voltage across its gap
- A short circuit collapses branch voltage to zero while surging current
- Zero current flow leaves downstream loads completely de-energized
- Thermal power scales with current squared, so doubling current quadruples dissipated heat
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 Electricity and Practical Circuits 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.
You clip your reference probe to a +5V rail and touch your red probe to a +12V supply line. What does the meter display?
Get it right to open this lesson and 21 more in the app.
Where Electricity and Practical Circuits takes you
- 1
Reading and Taming the Circuit
- Tracing Voltage and Current in the Field
- Resistors Under Real Conditions
- 2
Active and Reactive Components
- Capacitors as Dynamic Energy Buffers
- Inductors and Magnetic Energy Storage
- Solid-State Switching with Diodes and Transistors
- 3
System Dynamics and Power Distribution
- Alternating Current and Complex Impedance
- Power Delivery, Grounding, and Protection
3 sections · 7 units · 22 levels. Built to play, not to enroll.
You pick the voice
Electricity and Practical Circuits is taught in the The Professor style: clear, structured, thorough. 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
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.
Electric Circuits
Build an intuitive and practical grasp of electrical circuits from the ground up. Master current, voltage, and circuit laws, simplify complex networks with proven theorems, and predict dynamic circuit behavior over time.
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.
Practical Circuit Design
Move beyond basic breadboard recipes to design reliable, real-world circuits. Learn to drive high-power loads, shape signals with op-amps, clean up noisy power rails, and debug circuits with confidence.
Mastering the Flow: Practical Electronics
Move beyond simple batteries and bulbs to design circuits that solve real problems. Master the math of power, troubleshoot like a pro, and understand how modern gadgets actually think.
Electrical Power Systems
Analyze complex power distribution networks, diagnose high-frequency transients and harmonics, and design resilient protection schemes. Built for experienced electricians and engineers ready to tackle industrial-scale electrical engineering challenges.
Start Electricity and Practical Circuits today.
Download Tomo, search Electricity and Practical Circuits, and play your first lesson in under a minute.