Ohm's Law Calculator (V = R·I)
Find voltage and power from current and resistance.
Result
Voltage (V)
20.00
Power (W)
40.00
How it works
V = R·I · P = V·I
Ohm's law links voltage, current and resistance: V = R·I. Power is P = V·I (= R·I²). Example: 2 A through 10 Ω → 20 V, 40 W.
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Frequently asked questions
What is Ohm's law?
Voltage equals resistance times current: V = R·I.
How do I find the power?
Multiply voltage by current: P = V·I, equal to R·I².
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