DC circuitsQuestion 1338 of 1506

A 15 Ω resistor is connected across a 120 V supply. How much power does it dissipate?

  1. 960 W
  2. 480 W
  3. 16.0 W
  4. 1800 W
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Correct answer: 960 W

P = V² ÷ R = (120 V)² ÷ 15 Ω = 960 W.

Source: Computed, 2.4: Calculating Electric Power

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Questions last reviewed: 18 October 2026