Suppose one ideal resistive element has 12 V across it and 2 A through it. Both inputs are already in coherent base SI units, so the calculation is direct and every result is rational and exact.

Divide voltage by current

R = V/I = 12 V ÷ 2 A = 6 Ω. The unit follows from 1 Ω = 1 V/A.

Multiply voltage by current

P = V×I = 12 V × 2 A = 24 W. No intermediate display rounding is involved.

Cross-check with the derived equations

P=I²R gives 2²×6=24 W, and P=V²/R gives 12²÷6=24 W. Agreement checks the arithmetic; it does not add evidence about a real component rating.

Exact result

Voltage 12 V, current 2 A, resistance 6 Ω, and power 24 W form one exact ideal resistive operating point.