Calculate voltage, current, resistance, and power using Ohm's Law. Instant V=IR solver for electronics and electrical engineering.
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A
Ω
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Enter both values above to calculate
Ohm's Law Formulas
Voltage
V = I × R
V = P / I
V = √(P × R)
Current
I = V / R
I = P / V
I = √(P / R)
Resistance
R = V / I
R = V² / P
R = P / I²
Power
P = V × I
P = I² × R
P = V² / R
V = Voltage (Volts, V) | I = Current (Amperes, A) | R = Resistance (Ohms, Ω) | P = Power (Watts, W)