Circuit Simulator

Build and test electronic circuits with realistic physics (Kirchhoff's Laws, Ohm's Law)

Components

Select a component to place on breadboard

Hand Tool

Select & interact

Battery

DC 1.5V - 12V

AC Supply

AC 120V / 230V

Resistor

10Ω - 1MΩ

LED

6 colors available

Diodes

Standard/Zener/Schottky

Capacitor

Polarized 10μF-1000μF

Buzzer

Piezo buzzer max 12V

Breaker

Resettable 100mA-5A

Fuse

One-time 100mA-5A

Switch

SPST toggle

Button

Momentary tactile

Transistor

NPN BJT

Wire

0.01Ω/pixel resistance

Instructions

• Hand tool: Click to toggle switches/buttons
• Drag components to move (wires disconnect)
• Right-click: Delete or repair components
• Wire: Connect + and - terminals only
• DC battery: Constant voltage output
• AC supply: Sinusoidal alternating voltage
• Diodes: One-way current flow (anode → cathode)
• Add resistors to limit LED/component current

Zoom: 100%

Hand Tool: Drag components, click switches, right-click to delete

Circuit Stats

Ready to simulate

Electrical Values

Source Voltage

0.00V

Available Voltage

0.00V

Current Flow

0.00mA

Total Resistance

0.01Ω

Wire Resistance

0.000Ω

Power Dissipation0.00mW

Energy (1s)0.00mJ

Components

Wires0

Circuit Laws

• Ohm's Law: V = I × R
• Power: P = V × I
• Energy: E = P × t
• KVL: ΣV = 0 (loop)
• KCL: ΣI = 0 (node)
• LEDs need current-limiting resistors
• LED max current: 30mA
• Red LED drops ~1.8V, Blue ~3V
• Hold left-click to pan canvas
• Mouse wheel to zoom in/out
• Right-click to delete/repair