📐 Ohm's Law Calculator
Enter any two values to calculate Voltage (V), Current (I), Resistance (R), and Power (P).
V
A
Ω
W
Enter any two values above to calculate the rest
Ohm's Law Formulas
V = I × R
Voltage
I = V / R
Current
R = V / I
Resistance
P = V × I
Power
Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that the current through a conductor is directly proportional to the voltage and inversely proportional to the resistance: V = I × R.
How do I calculate power?
Power (P) = Voltage (V) × Current (I), or P = I² × R, or P = V² / R.