Calculate voltage, current, resistance, and power using Ohm's fundamental law of electrical circuits. Enter any two values to calculate the missing parameters.
Enter values and click Calculate to see results
Ohm's Law is one of the most fundamental laws in electrical engineering, discovered by German physicist Georg Simon Ohm in 1827. It states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Enter any two known values (Voltage, Current, or Resistance) and click Calculate. The calculator will automatically solve for the missing value using Ohm's Law.
If a circuit has Voltage = 12V and Resistance = 4Ω, then Current = 12 ÷ 4 = 3 Amperes. Power = 12 × 3 = 36 Watts.
A: 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.
A: Ohm's Law applies directly to DC circuits. For AC circuits, use impedance (Z) instead of resistance (R).
A: Voltage in Volts (V), Current in Amperes (A), Resistance in Ohms (Ω), and Power in Watts (W).
A: The calculator uses the first two valid values and verifies consistency with the third.