Power & current
Ohm’s law calculator
Find voltage, current, resistance and power in a DC resistive circuit.
Result
Ohm’s lawReady
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Enter your values and press Calculate result.Formula
V = I × RWithin this model
Steady DC through a positive, constant, ohmic resistance. Uses magnitudes. This model does not describe reactive AC loads or a complete installation.
What the numbers mean
Ohm’s law relates voltage across a resistor to current through it. Choose the two quantities you know. Power is calculated from voltage multiplied by current. Temperature changes and non-ohmic components can change the relationship.
Formula reference: Fluke · Ohm’s law ↗A worked example
A 12 V potential difference across 6 Ω gives 2 A. The resistor dissipates 24 W.
Validation, precision and limitations