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Ohm's Law Calculator

Enter any two of voltage, current, resistance and power to derive the rest

Known values

Fill in any two of voltage, current, resistance and power

Result
  • Voltage5 V
  • Current22.73 mA
  • Resistance220 Ω
  • Power113.6 mW
V = 5 V · I = 22.73 mA
Relations
V = I × RI = V / RR = V / IP = V × I = I² × R = V² / R

Ohm's law gives V = I × R and P = V × I. Current is entered in mA and converted to A internally; supplying more than two values cross-checks them, so a unit slip shows up as a mismatch.