Ohm's Law Visualizer

Interactive Series and Parallel Resistive Circuits

Series Circuit

12V
100Ω
200Ω
300Ω
Total Resistance: 600Ω
Total Current: 0.02A
Voltage Drop R1: 2V
Voltage Drop R2: 4V
Voltage Drop R3: 6V

Parallel Circuit

12V
100Ω
200Ω
300Ω
Total Resistance: 54.55Ω
Total Current: 0.22A
Current R1: 0.12A
Current R2: 0.06A
Current R3: 0.04A
Voltage Source
Resistor
Current Flow
Wire/Connection

Ohm's Law Formulas

Ohm's Law

V = I × R

Voltage = Current × Resistance

Series Resistance

Rtotal = R1 + R2 + R3 + ...

Resistances add up

Parallel Resistance

1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ...

Reciprocal of total equals sum of reciprocals

Power

P = V × I = I² × R = V² / R

Multiple ways to calculate power

Adjust the sliders to change voltage and resistance values. Observe how current and voltage distribution change in real-time.