DC circuitsQuestion 1339 of 1506

A 60 Ω resistor is connected across a 120 V supply. How much power does it dissipate?

  1. 240 W
  2. 120 W
  3. 4.00 W
  4. 7200 W
Show answer

Correct answer: 240 W

P = V² ÷ R = (120 V)² ÷ 60 Ω = 240 W.

Source: Computed, 2.4: Calculating Electric Power

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Questions last reviewed: 18 October 2026