Ohms law
Calculate current and power from voltage and resistance.
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Current is voltage ÷ resistance. Power is voltage² ÷ resistance. Resistance must be positive. Use volts and ohms in the fields shown. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
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How to use Ohms law
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What to expect
Calculate current and power from voltage and resistance. Current is voltage ÷ resistance. Power is voltage² ÷ resistance. Resistance must be positive. Use volts and ohms in the fields shown.