Build and test circuits with batteries, resistors, light bulbs, and switches. Learn about series and parallel circuits, Ohm's law, and conductors and insulators.

Build and test circuits with batteries, resistors, light bulbs, and switches. Learn about series and parallel circuits, Ohm's law, and conductors and insulators.

Build circuits with batteries, resistors, ideal and non-Ohmic light bulbs, fuses, and switches. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. View the circuit as a schematic diagram, or switch to a lifelike view.

Real-time circuit simulation engine is custom-built for speed and interactivity. Easy one-click simulation, from simple resistors and logic gates, to complex transistor-level oscillators and mixed-signal designs.

The DC Circuit Builder equips the learner with a virtual electronic circuit board. Add resistors, light bulbs, wires and ammeters to build a circuit, Explore Ohm's law. Compare and contrast series, parallel and combination circuits. Use a voltmeter to measure voltage drops.

Design and build your own circuits with Circuit Construction Kit: DC! Test everyday objects to see if they’re conductors or insulators, and explore how electricity flows through series and parallel circuits. In Circuit Construction Kit: DC, experiment with basic electricity by designing and building circuits from scratch.

OpenCircuits is an online digital circuit designer and simulator. Easy to use and completely free. Create your own circuits or experiment with others!

Build and test circuits with batteries, resistors, light bulbs, and switches. Learn about series and parallel circuits, Ohm's law, and conductors and insulators.

Experiment with an electronics kit! Design and Build your own circuits. Discover if everyday objects are conductors or insulators. Play the game.

Build and simulate circuits right in your browser. Design with our easy-to-use schematic editor. Analog & digital circuit simulations in seconds. Professional schematic PDFs, wiring diagrams, and plots. No installation required! Launch it instantly with one click. Launch CircuitLab or watch a quick demo video →