ClueLuma

DC and resistive AC power calculator

Multiply voltage and current for DC or unity-power-factor resistive input.

P=V×IP = V \times I

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

V
A
W

Worked example

Given

  • VV = 100 V
  • II = 0.85 A
P=100×0.85=85P = 100 \times 0.85 = 85

Symbols and units

SymbolMeaningUnit
PPreal powerW
VVvoltageV
IIcurrentA

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.