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Ohm's Law Calculator

Variable Legend

V= voltage (V)I= current (A)R= resistance (Ω)P= power (W)

Ohm's law triangle

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Pro Tip

Always verify your input values before calculating. For ohms law calc, small input errors can compound and significantly affect the final result.

Difficulty:Beginner

Did you know?

Georg Ohm discovered this law in 1827, but the scientific community initially rejected it. It took years of experimental verification before his work gained acceptance.

Mathematically verified
Reviewed May 2026
Used 37K+ times
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