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Resistance power and I²R loss calculator

Current squared times resistance gives resistive heating and conductor loss.

P=I2×RP = I^{2} \times R

Calculator

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

A
Ω
W

Worked example

Given

  • II = 0.85 A
  • RR = 100 Ω
P=0.852×100=72.25P = {0.85}^{2} \times 100 = 72.25

Symbols and units

SymbolMeaningUnit
PPreal powerW
IIcurrentA
RRresistanceΩ

Related calculators

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