The Flow of Power
Ever wonder why a lightbulb glows or how your phone charges? Learn the simple math behind electricity by imagining it as water flowing through pipes.
Like Duolingo, but for The Flow of Power. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 26 levels across 3 sections, about 52 minutes end to end, roughly 10 days at five minutes a day. It moves through The Basics of Flow, Doing the Math, and Electricity in Action. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in The Flow of Power
- Voltage acts as the electrical pressure or push
- Current cannot flow without a potential difference
- Voltage is defined as electric potential energy per unit charge
- Higher voltage means more work can be performed
- Voltage is analogous to pressure in a fluid system
- Current represents the movement of the medium (water or electrons)
- Mapping the water-pipe analogy to electrical components
- The relationship between voltage and potential energy
- Voltage represents the push or pressure in a circuit
- Amperage represents the volume of charge moving past a point
- Amps measure the rate of flow per second
- The Coulomb is the unit for electrical charge
- The conceptual difference between electrical pressure and flow volume
- The definition of an Ampere as a rate of charge per unit of time
- Amperage represents the actual amount of electricity being consumed
- Devices that do more work require a higher volume of charge flow
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 The Flow of Power 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 does voltage do to help electricity start moving along a wire?
Get it right to open this lesson and 25 more in the app.
Where The Flow of Power takes you
- 1
The Basics of Flow
- Voltage: The Pressure in the Pipe
- Amps: The Speed of the Current
- Resistance: The Narrow Squeeze
- How Volts and Amps Work Together
- 2
Doing the Math
- The Magic Triangle Formula
- Calculating Your Energy Needs
- Watts: The Total Power Output
- Finding the Missing Number
- Real World Math for Home Gadgets
- Safety Limits and Blown Fuses
- 3
Electricity in Action
- Why Batteries Run Out
- Charging Your Phone Fast vs Slow
- The Cost of Leaving Lights On
3 sections · 13 units · 26 levels. Built to play, not to enroll.
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
The Flow of Power is taught in the Explain Like I'm 5 style: no big words. promise.. 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.
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Start The Flow of Power today.
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