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Ohm's Law Calculator
Calculate voltage, current, resistance and power from any two values using Ohm's law (V = I × R).
Tip from Tink: Power in watts is volts × amps.
Fill in any two and leave the third empty.
Voltage
12 V
Current
3 A
Resistance
4 Ω
Power
36 W
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How to use the Ohm's Law Calculator
- Fill in any two of voltage, current and resistance.
- Leave the third empty.
- Read all four values.
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