This DC power calculator finds the power in a DC circuit from voltage, current, or resistance. Enter any two values above to get the power in watts.
Formulas
P = V × I = I² × R = V² ÷ R
Example
12 V, 2 A: P = 12 × 2 = 24 W.
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Frequently Asked Questions
How do I calculate DC power?
Multiply voltage by current, or use I squared times R, or V squared divided by R.
How do I find power from current and resistance?
Square the current and multiply by resistance: P = I squared times R.
What are the units of power?
Watts, where one watt equals one volt-amp in a DC circuit.