Ohm's Law Calculator
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Calculator
Enter any two values to calculate the others.
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Unit Conversion Reference
Voltage
1 kV = 1000 V
1 V = 1000 mV
Current
1 A = 1000 mA
Resistance
1 kΩ = 1000 Ω
1 MΩ = 1,000,000 Ω
Power
1 kW = 1000 W
1 MW = 1,000,000 W
1 hp ≈ 745.7 W
1 BTU/h ≈ 0.293 W
Formula Wheel
Ohm's Law Formulas
Voltage (V)
V = I × R
V = P / I
Current (I)
I = V / R
I = P / V
Resistance (R)
R = V / I
R = P / I²
Power (P)
P = V × I
P = I² × R
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