Ohm's Law Calculator

Calculate voltage, current, resistance, and power from any two known values.

CALCULATE

Formulas

V = I × R

V = Voltage (V), I = Current (A), R = Resistance (Ω)

P = V × I = I² × R = V² / R

P = Power (Watts)

Understanding Ohm's Law

Ohm's Law describes the relationship between voltage, current, and resistance. Formulated by Georg Simon Ohm in 1827, it states that current is directly proportional to voltage and inversely proportional to resistance.

Practical example

A 12V battery with a 100Ω resistor: Current = 12V / 100Ω = 0.12A. Power = 12V × 0.12A = 1.44W.

Limitations

Applies to linear (ohmic) materials only. Does not apply to diodes, transistors, or temperature-dependent devices.

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