Ohm's Law Calculator
V = I × R. Enter any two known values and instantly solve for the third, plus power (watts).
Voltage
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Volts
Current
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Amps
Resistance
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Ohms
Power
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Watts
How this was calculated
V = I × R — Ohm's Law: voltage equals current times resistance.
I = V / R — Current equals voltage divided by resistance.
R = V / I — Resistance equals voltage divided by current.
P = V × I — Power is always calculated as a bonus output.
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Book a free strategy call →Understanding Ohm's Law
Ohm's Law is the most fundamental relationship in electrical engineering: V = IR. It states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance as the constant of proportionality.
Applications range from simple circuit analysis to sizing conductors, selecting fuses, and designing motor control systems in industrial and oilfield environments.
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