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Ohm's Law Calculator

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Variable Legend

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

Ohm's law triangle

Power wheel

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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.

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Reviewed June 2026
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