Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two known values to calculate the remaining values.
Ohm's Law Inputs
Enter exactly two known values. The calculator will determine the remaining two values.
Calculation Result
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Ohm's Law Results
Voltage
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Current
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Resistance
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Power
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Step-by-Step Calculation
Ohm's Law Formulas
Voltage
V=I × R
Current
I=V / R
Resistance
R=V / I
Power
P=V × I
Power Formulas
P=I² × R
P=V² / R
Example
Suppose a circuit has a voltage of 12 V and a resistance of 6 Ω.
I=V / R
I=12 / 6=2 A
P=V × I=12 × 2=24 W
Therefore, the circuit draws 2 Aand dissipates 24 W.