Ohm's Law Calculator
Use this free electrical calculator to find the missing value among voltage, current and resistance. Enter any two values and leave the third empty.
Ohm's Law formulas
The calculator applies V = I × R. From this relationship, it calculates resistance as R = V ÷ I, current as I = V ÷ R, or voltage as V = I × R.
How to use it
Enter any two of the three fields: voltage in volts, current in amperes, and resistance in ohms. Select Calculate Missing Value to display the result.
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