Circuit Builder & Simulator

Build circuits, measure voltage, current, and resistance - learn Ohm's Law in action!

Components

Preset Circuits

Click a component, then click on the canvas to place it. Connect components with wires.

Measurements

Total Voltage
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Volts (V)
Current Flow
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Amps (A)
Total Resistance
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Ohms (Ω)
Power
0.00
Watts (W)

Ohm's Law

V = I × R (Voltage)
I = V / R (Current)
R = V / I (Resistance)
P = V × I (Power)

Series Resistors

Rtotal = R₁ + R₂ + R₃...

Parallel Resistors

1/Rtotal = 1/R₁ + 1/R₂ + 1/R₃...