Ohm's Law Calculator
Solve V=IR for Voltage, Current, or Resistance, plus Power.
Enter Values
Leave exactly one field blank — it will be solved automatically.
V
A
Ω
Results
Solved: Current
3
Voltage
12V
Current
3A
Resistance
4Ω
Power
W36
P = V × I
Solve V=IR for Voltage, Current, or Resistance, plus Power.
Leave exactly one field blank — it will be solved automatically.
Solved: Current
3
Voltage
12V
Current
3A
Resistance
4Ω
Power
W36
P = V × I