Animated Engines uses animations to show how several types of engines work.
Falstad
This browser-based circuit simulator displays an animated LRC circuit and uses color to show voltage polarity and ground.
About Falstad
Falstad is an electronic circuit simulator that starts with an animated schematic of a simple LRC circuit. Green indicates positive voltage, red indicates negative voltage, gray indicates ground, and moving yellow dots indicate current.
Users can click a switch to turn it on or off, move the mouse over a component to see its description and current state, and edit a component through a right-click or control-click menu. The Circuits menu contains sample circuits, and standalone offline versions and a JavaScript version with subcircuits are listed.
Key features
- Color-coded display for voltage polarity and ground
- Animated yellow dots indicate current flow
- Click switches to turn them on or off
- Hover to view component description and state
- Edit components through right-click menu
- Sample circuits available in Circuits menu
Best for: People studying basic electronics who want to visualize voltage, current, and component behavior in sample circuits.
Good for
- Animated display shows voltage polarity, ground, and current
- Hover shows component description and current state
- Sample circuits available to try
Falstad at a glance
- Website
- falstad.com/circuit
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Falstad FAQ
What do the colors and moving dots mean?
Green indicates positive voltage, red indicates negative voltage, gray indicates ground, and moving yellow dots indicate current.
How do I turn a switch on or off?
Click on the switch.
How do I modify a component?
Move the mouse over it, click the right mouse button or control-click on a Mac, and select Edit.
Is something wrong or out of date?
Tell us and an editor will check it.
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