Circuit & Ohm’s Law Lab
Build a circuit, slide the voltage and resistance, and watch Ohm’s law V = I·R light it up — with series vs parallel side by side.
This is an exact DC circuit solver — no faked numbers. Pick a preset or add resistors, switch between series and parallel, and tune the battery voltage and each resistance. Watch the current I = V/R flow as charge carriers, the bulb brighten with its power, and the table show how series circuits share one current while parallel branches share one voltage.
Ohm’s law · I = V / R
I = 9 V / 0 Ω = 0.00 A
Total resistance: 0 ΩTotal power: P = V·I = 0.00 W
Series · 0R
Wiring
Presets
Per-resistor breakdown
| R | Voltage drop | Current | Power |
|---|
Total resistance: 0 ΩTotal current: 0.00 A
Selected resistor
Tap a resistor on the canvas, a chip, or a row in the table to read its voltage drop, current and power — and adjust its resistance live.
Formulas & sources
V = I·R
P = V·I = I²R = V²/R
Series: R = Σ Rᵢ
Parallel: 1/R = Σ 1/Rᵢ