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Ohm's Law Calculator
V = I × R — enter any two values to calculate the rest, including power (P = V × I).
Solve for
Formula: V = IR · P = VI · P = I²R · P = V²/R
V = I × R
Enter any two known values:
mA
Ω
mW
Quick Reference
V = I × RI = V / RR = V / IP = V × IP = I² × RP = V² / RI = P / VV = P / I