Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Essential tool for electronics and electrical engineering.
Ohm's Triangle
V = I × R
I = V / R
R = V / I
calculators.ohmsLaw.calculated.resistance
6.00 Ω
Voltage (V)
12.00 V
Current (A)
2.0000 A
Resistance (Ω)
6.00 Ω
Power (W)
24.00 W
P = V × I or P = I² × R or P = V² / R
P = V × I
12.00 × 2.0000 = 24.00 W
P = V² / R
144.00 / 6.00 = 24.00 W
P = I² × R
4.000000 × 6.00 = 24.00 W
milliamps
2000.00 mA
Common Values
What is Ohm's Law?
Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. It states that current is directly proportional to voltage and inversely proportional to resistance.
Ohm's Law Formula
V = I × R (Voltage = Current × Resistance). This fundamental equation relates the three key electrical quantities.
Practical Applications
Ohm's Law is used in circuit design, calculating component values, determining power requirements, and troubleshooting electrical systems.